C#.NET — Which is a correct implementation of the IPerson interface? interface IPerson { string FirstName { get; set; } }

Introduction / Context:
The problem asks you to identify correct C# syntax for implementing a simple interface property. It also tests awareness of explicit vs. implicit interface implementation and the correct inheritance syntax.

Given Data / Assumptions:

• IPerson declares string FirstName { get; set; }.
• We want a valid class that compiles and implements the property.

Concept / Approach:
To implement an interface implicitly, the class must list the interface after its name using a colon and then provide a public member with the same signature. Explicit interface implementation would use the qualified name IPerson.FirstName, but the class must still declare that it implements IPerson.

Step-by-Step Solution:

Verification / Alternative check:
Compile Option A — succeeds. Compile B/C — fail with syntax/interface errors.

Why Other Options Are Wrong:
B lacks : IPerson and misuses explicit implementation syntax; C is not C# syntax.

Common Pitfalls:
Confusing VB “Implements” with C#’s colon syntax, and forgetting that explicit property implementations need the interface qualification and no access modifiers.

Final Answer:
class Employee : IPerson { ... public string FirstName { get; set; } }