What does the const qualifier do to a variable?

• A. It makes the variable global
• B. It prevents modification of the value after initialization
• C. It allocates dynamic memory
• D. It makes the variable volatile

Answer: (B)

Const marks an object as read-only for code that accesses it with that qualifier. After you initialize a const variable, its value cannot be changed through that identifier, which is why it prevents modification after initialization. This qualifier doesn’t make a variable global, doesn’t allocate memory, and isn’t related to volatility. Its purpose is to enforce immutability for that name at compile time.