[&] Which technique involves checking data against expected formats and constraints?
- Output Encoding
- Data Validation
- Regular Expression Filtering
- Input Sanitization

[&] What is the role of input sanitization in input filtering?
- To improve user interface responsiveness
- To reject all user input
- To escape or clean input data from dangerous characters
- To minimize server processing times

[&] What is a limitation of using regular expressions for input filtering?
- They are only available in client-side filtering
- Regular expressions cannot handle numeric input
- Regular expressions slow down the network speed
- Improper usage can introduce vulnerabilities

[&] Why is server-side filtering generally preferred over client-side filtering?
- Server-side filtering reduces server load
- Client-side filtering cannot use regular expressions
- Server-side filtering is invisible to the user
- Client-side filtering is easily bypassed by examining source code

[&] Which of the following is a common vulnerability mitigated by input filtering?
- Phishing
- Cross-Site Scripting (XSS)
- Buffer Overflow
- Man-in-the-Middle Attack

[&] What is the primary purpose of input filtering in web applications?
- To provide an interactive user experience
- To inspect and control data input and output for security
- To enhance application performance
- To facilitate faster loading times