Why does CSMA/CD use exponential random backoff, instead of choosing a random wait time from a fixed interval? (Select all that apply.) waiting too-long a time when few nodes are competing for access means that the channel will often be idle, reducing efficiency waiting too short a time when many nodes are competing for access will lead to many collisions, reducing efficiency using a random wait time from a fixed interval would be more efficient, but the benefit is more than offset by the computational cost of calculating the random value using a random wait time is not an approved protocol according to the Internet Assignment Numbers Authority