scope = dsp.SpectrumAnalyzer1. This object displays the frequency spectrum of real- and complex-valued floating- and fixed-point signals.2.It displays power spectrum as default3.It displays  the psd centred around carrier frequency for bpsk by default4.It plots default between -4 to +4 KHz onlySelect one:a. 1,2 is correctb. none are correctc. all statements are correctd. 2,3,  is correcte. 3, 4 is correct

Without the specific details about the dsp.SpectrumAnalyzer object, it's hard to definitively answer this question. However, generally speaking, a spectrum analyzer is used to measure the magnitude of an input signal versus frequency within the full frequency range of the instrument.

1. It's plausible that the dsp.SpectrumAnalyzer object can display the frequency spectrum of real- and complex-valued floating- and fixed-point signals. This would depend on the specific capabilities of the object.

2. It's also plausible that it displays power spectrum as default. This is a common function of spectrum analyzers.

3. Whether it displays the psd centred around carrier frequency for bpsk by default would depend on the specific settings and capabilities of the dsp.SpectrumAnalyzer object.

4. The range of -4 to +4 KHz only seems quite limited for a spectrum analyzer, but it could be possible if this is a specific setting or limitation of the dsp.SpectrumAnalyzer object.

Without more specific information, it's hard to definitively say which of these statements are correct.

Without the specific details about the dsp.SpectrumAnalyzer object, it's hard to definitively answer this question. However, generally speaking, a spectrum analyzer is used to measure the magnitude of an input signal versus frequency within the full frequency range of the instrument. It's typically used for analyzing the spectral composition of electrical, acoustic, or optical waveform.

1. This statement seems plausible. A spectrum analyzer should be able to display the frequency spectrum of both real and complex-valued signals, whether they're floating- or fixed-point.

2. This statement is also likely to be correct. The power spectrum is a common default for spectrum analyzers.

3. This statement might be correct, but it depends on the specific implementation of the dsp.SpectrumAnalyzer object. Not all spectrum analyzers might display the power spectral density (PSD) centered around the carrier frequency for binary phase shift keying (BPSK) by default.

4. This statement is also dependent on the specific implementation. Some spectrum analyzers might have a default plot range of -4 to +4 KHz, while others might not.

Without more specific information about the dsp.SpectrumAnalyzer object, it's hard to definitively say which option is correct. However, based on the general knowledge of spectrum analyzers, option a. 1,2 is correct seems most likely.