In LISP programming, which function call correctly assigns the numeric value 10 to the symbol a (i.e., sets a to 10)?

Introduction / Context: LISP uses prefix notation and provides special forms for variable binding and assignment. A common beginner task is to set a symbol to a numeric value. Selecting the correct form builds confidence with fundamental LISP syntax and semantics.

Given Data / Assumptions:

• We want to assign the integer 10 to the symbol a.
• We consider standard Common Lisp special forms and functions.
• We distinguish between binding in a local scope and global or dynamic assignment.

Concept / Approach: In Common Lisp, setq assigns a value to a variable (symbol) that already exists or establishes it in the appropriate scope. The canonical assignment to set a to 10 is (setq a 10). setf is a generalized assignment macro, but (setf 10 a) is invalid because the place must be something assignable, not a literal. let creates new bindings in a local scope and requires a list of pairs; (let (a 10)) is not the correct binding syntax, which would be (let ((a 10)) ...). There is no standard assign special form in Common Lisp.

Step-by-Step Solution:

Verification / Alternative check: Running (setq a 10) in a REPL yields 10 and thereafter evaluating a produces 10, verifying the assignment.

Why Other Options Are Wrong:

Common Pitfalls: Confusing local binding with assignment; misplacing arguments to setf; forgetting that literals cannot be assignment targets.

Final Answer: (setq a 10)