Consider sending an IP datagram of size 1420 bytes (including 20 bytes of IP header)

from a sender to a receiver over a path of two links with a router between them. The first

link (sender to router) has an MTU (Maximum Transmission Unit) size of 542 bytes,

while the second link (router to receiver) has an MTU size of 360 bytes. The number of

fragments that would be delivered at the receiver is