1.3-2 Packet switching versus circuit switching (1).  Which of the characteristics below are associated with the technique of packet switching? Select all correct answers. [Hint: more than one of the answers is correct].多项选择题

Frequency Division Multiplexing (FDM) and Time Division Multiplexing (TDM) are two approaches for implementing this technique.

Congestion loss and variable end-end delays are possible with this technique.

Reserves resources needed for a call from source to destination.

This technique was the basis for the telephone call switching during the 20th century and into the beginning of this current century.

Resources are used on demand, not reserved in advance.

This technique is used in the Internet.

Data may be queued before being transmitted due to other user's data that's also queueing for transmission.