Head$-$of$-$line blocking in HTTP means A$.$ It takes too much time to send a large object, so the others that follow have to wait even if they are much smaller in size B$.$ the earliest packet in a connection is corrupted so subsequent packets cannot be sent C$.$ the earliest pakcet in a connection is dropped so subsequent packets cannot be sent D$.$ the ACk of one of the packets gets lost os every other packet is blocked E$.$ it takes no time to send a small object, so a large object must be transmitted first