Question on Interface

public interface Foo { int k = 4; /* Line 3 */ } Which three piece of codes are equivalent to line 3? final int k = 4; public int k = 4; static int k = 4; abstract int k = 4; volatile int k = 4; protected int k = 4;

A. 1, 2 and 3 B. 2, 3 and 4 C. 3, 4 and 5 D. 4, 5 and 6

Answer: Option A

Explanation:

(1), (2) and (3) are correct. Interfaces can have constants, which are always implicitly public, static, and final. Interface constant declarations of public,static, and final are optional in any combination.