On (A={1,2,3,4,5,6,7,8}), (aRb) if and only if (a-b) is divisible by (4). Which is the equivalence class of (3)?

Correct answer: ({3,7})

Step 1: The remainder of (3) on division by (4) is (3). Step 2: In the given set, the elements with remainder (3) are (3) and (7). Step 3: While writing an equivalence class, include only elements from the given base set.