Which statement is true regarding classless routing protocols?1. The use of discontiguous networks is not allowed.2. The use of variable length subnet masks is permitted.3. RIPv1 is a classless routing protocol.4. IGRP supports classless routing within the same autonomous system.5. RIPv2 supports classless routing.

• A. None of these
• B. 1, 3 and 5
• C. 3 and 4
• D. 2 and 5

Answer: (D)