Let us analyze each option:
Option A: Incorrect. A route does not include MAC addresses. It typically consists of a destination network, subnet mask, next-hop address, and outgoing interface.
Option B: Correct. IP routes are essential for guiding the forwarding of IP packets from the source to the destination. Routers use routing tables to determine the best path for packet delivery.
Option C: Incorrect. Routing is a concept at the network layer (Layer 3) of the OSI model, not the data link layer (Layer 2).
Option D: Incorrect. A route does not require the source address. It only needs the destination network, subnet mask, and next-hop information.
Thus, the correct answer is B.