Select the right answer for the following questions:

Random Access MAC protocols are:

a$*$Efficient for low channel load since the collision probability will be less.

b$*$Efficient for high channel load since the collision probability will be less.

c$*$Efficient for low channel load since the collision probability will be high.

d$*$Efficient for high channel load since the collision probability will be high.

e$*$None is true.

Select the right answer $($s$)$

Transport layer can't provide the following services if the network layer has no guarantee about:

a$*$Reliability$.$

b$*$Security$.$

c$*$Avoiding Delay.

d$*$Maximum Bandwidth.

$*$None is true.

TDMA and FDMA belong to which MAC protocols taxonomy:

a$*$Channel partitioning.

b$*$Random access.

c$*$Taking turns.

d$*$Bluetooth$.$

e$*$None is true.