Which practice focuses on removing unused code and ensuring errors are handled gracefully?

• A. Defensive Coding
• B. Digital Signature
• C. Deployment
• D. DML

Answer: (A)

Defensive coding is about building software that remains reliable when things go wrong. It emphasizes validating inputs, checking for nulls and bounds, and handling errors gracefully so the program can fail safely rather than crash or produce incorrect results. It also aims to reduce failure opportunities by keeping the codebase lean, which often involves removing unused or dead code that could hide bugs or cause unpredictable behavior. This combination—anticipating problems, managing errors gracefully, and trimming unnecessary code—fits the description of removing unused code and ensuring errors are handled gracefully.

Digital signatures focus on verifying identity and data integrity. Deployment deals with releasing and configuring software in environments. DML refers to data manipulation language in SQL.