Which of the following tasks could be attained using syntax trees in compiler…

Answer: Type checking, Code generation, and Code optimization.

Explanation:

• Type checking: During semantic analysis the compiler traverses the syntax tree to infer and verify types and enforce semantic rules (e.g., type compatibility, scope resolution).

• Code generation: The syntax tree is visited to emit intermediate or target code because tree nodes map naturally to operations and control flow constructs.

• Code optimization: Optimizations are implemented as transformations or analyses on the syntax tree (for example, constant folding, inlining, and dead-code elimination).

• Error handling: While semantic errors found during tree traversal are reported using information from the syntax tree, general syntactic error detection and recovery are handled by the parser. Therefore, error handling is not primarily a task achieved by syntax trees.

Because syntax trees directly support type checking, code generation, and code optimization, the correct set of tasks is those three.