Which header file is essential for using strcmp() function?Optionsstring.hstrings.htext.hstrcmp.h

Which header file must be included to use the string class in C++?<iostream><string><cstring><stdlib.h>

Which of the following extension is used for user-defined header file in c++? Options hg cpp h hf

Select the correct answerWhich header file is required for dynamic memory allocation functions in C?Optionsstdio.hstdlib.hstring.hmalloc.h

Which of the library function put back the length of a string?a.strlenb.strcatc.strcmpd.strcpy

How do you include a header file in a C program?OptionsUsing the #define directiveUsing the #pragma directiveUsing the #include directive