14Which tool should an application developer use to help identify input validation vulnerabilities? A filter A sniffer A fuzzer A scanner

An application developer should use a fuzzer to help identify input validation vulnerabilities.

Here's why:

1. A fuzzer is a tool used in testing where it injects random and invalid data into the software application to find issues, crashes, failing built-in code, etc.

2. When it comes to input validation vulnerabilities, a fuzzer can be very effective. It can help identify how the system behaves with unexpected input data, which is crucial in identifying potential security vulnerabilities.

3. Filters, sniffers, and scanners have their uses in application development and security, but they are not specifically designed for identifying input validation vulnerabilities.

4. A filter is used to allow or deny network traffic. A sniffer is used to capture network traffic. A scanner is used to identify network vulnerabilities.

5. Therefore, to identify input validation vulnerabilities, a fuzzer would be the most appropriate tool for an application developer to use.