Assume the configuration: a b c where a-b has an mtu of 2100 bytes and b-c has an mtu of 700 bytes. assume that link layer frames require 30 bytes of overhead, an ip header is 20 bytes, there is no loss in the network, and a always tries to send full frames to c. for every packet that a sends, how many ip packets will cross the link from b to c? a. 6 packetsb. 5 packetsc. 3 packetsd. 4 packets