$6\mathrm{.}3\mathrm{.}3.$ Polling and token$-$passing protocols. Which of the following statements is true about polling and token$-$passing protocols?

There can be simultaneous transmissions resulting in collisions.

$$ There can be times when the channel is idle for more than a short period of time, when a node has a frame to send, but is prevented from doing so by the medium access protocol.

These protocol can achieve close $100\%$ utilization, in the case that there is only one node that always has frames to send $($the fact that the utilization is close to$,$ but not exactly, $100\%$ is due to a small amount of medium access overhead but not due to collisions$)$

These protocol can achieve close to $100\%$ channel utilization, in the case that all nodes always have frames to send $($the fact that the utilization is close to$,$ but not exactly, $100\%$ is due to a small amount of medium access overhead but not due to collisions$)$