can you answer these questions

1)Which of the following is an alternative for implementing packet switching? a. Frequency-Division Multiplexing b. CDMA c. Time-Division Multiplexing d. None

2)What layer of the TCP/IP protocol model determines the best path through the network? a. Application b. Transport c. Session d. Internet e. Network Access

3) RIP can work but OSPF cannot work in which of the networks below? a. Networks with more than 20 hops b. Network using variable length subnetting mask (VLSM) c. Network using bandwidth as metric d. None of these