C#.NET — Choose the correct method declaration for: accepts (int, Single, double) and returns decimal. If a procedure fun() is to receive an int, a Single, and a double, and it must return a decimal, which of the following is the correct way to define it?

Introduction / Context:
This item focuses on C# method signature syntax: placement of the return type, optional static modifier, correct parameter types, and valid return statements.

Given Data / Assumptions:

• Parameters: int, Single (System.Single), double.
• Return type: decimal.
• Method name: fun.

Concept / Approach:
In C#, the syntax is: [modifiers] return_type MethodName(parameters) { body }. The return type precedes the method name. System.Single is the CLR type for float, and is valid in signatures. The method may be static or instance; both compile; the choice here uses static and is syntactically correct.

Step-by-Step Solution:

Verification / Alternative check:
Compiling a stub with option B succeeds. Replacing Single with float also works, since float is the C# keyword alias for System.Single.

Why Other Options Are Wrong:

• A/D: wrong placement of the return type.
• C: misuse of type name in return statement.
• E: factually false.

Common Pitfalls:
Confusing C# with languages that place return types elsewhere; forgetting that Single is valid; or thinking that methods must be static (they do not).

Final Answer:
static decimal fun(int i, Single j, double k) { ... }