When a router cannot route a datagram or host cannot deliver a datagram, the datagram is discarded and the router or the host sends a ____________ message back to the source host that initiated the datagram.

When a router cannot route a datagram or host cannot deliver a datagra

1.	When a router cannot route a datagram or host cannot deliver a datagram, the datagram is discarded and the router or the host sends a ____________ message back to the source host that initiated the datagram.
A.	Destination unreachable
B.	Source quench
C.	Router error
D.	Time exceeded
Answer» B. Source quench