Which operation converts a string to all uppercase letters?

Which operation converts a string to all uppercase letters?

• A. Upper
• B. String handling
• C. Length
• D. Lower

Answer: (A)

Converting every letter in a string to its uppercase form is a specific transformation that maps each alphabetic character to uppercase while leaving non-letter characters unchanged. This is exactly what the uppercase operation does, often called something like toUpperCase or Upper in programming. It’s the right choice because it applies a uniform change across the whole string, producing a version where all letters are capitalized, such as turning "Hello, World!" into "HELLO, WORLD!". Other options describe different ideas: one refers to handling strings in general rather than changing their case, another reports how many characters are in the string, and the last would make letters lowercase instead of uppercase.

Converting every letter in a string to its uppercase form is a specific transformation that maps each alphabetic character to uppercase while leaving non-letter characters unchanged. This is exactly what the uppercase operation does, often called something like toUpperCase or Upper in programming. It’s the right choice because it applies a uniform change across the whole string, producing a version where all letters are capitalized, such as turning "Hello, World!" into "HELLO, WORLD!".

Other options describe different ideas: one refers to handling strings in general rather than changing their case, another reports how many characters are in the string, and the last would make letters lowercase instead of uppercase.