In C#, how many values can a function return directly via its return value?

Introduction / Context:
This question targets the difference between a function's single return value and alternative mechanisms for producing multiple outputs.

Given Data / Assumptions:

• We are asked about the direct return value of a function.
• Other mechanisms like ref/out or tuples are outside the narrow definition unless the return type itself aggregates multiple fields.

Concept / Approach:
A C# function has exactly one return value at a call site. You can return a composite type (e.g., a tuple or a struct) to group several values, but syntactically there is still one returned object. Therefore, the count of direct return values is one.

Step-by-Step Solution:

Verification / Alternative check:
Inspect function signatures and call sites; each call receives one returned instance.

Why Other Options Are Wrong:

• 0: Functions with non-void types must return a value.
• params / ref-based options: Do not change direct return arity.
• Any number of values: Not accurate without aggregating into a single return object.

Common Pitfalls:
Confusing multiple outputs through ref/out or tuples with multiple discrete return values.

Final Answer:
1