Which statement describes the correct use of addresses to deliver an e-mail message from HostB to the e-mail service that is running on ServerA?

HostB uses the MAC address of ServerA as the destination.
Router B uses a Layer 3 network address to route the packet.
Router A uses the Layer 4 address to forward the packet to Router B.
Via the use of a Layer 3 address, ServerA assigns the message to the e-mail service.