When using the no speed command on an interface, what is the resulting change made?

A) The speed defaults to the lowest possible value.
B) The speed setting is no longer recorded for the interface.
C) The speed setting defaults to its automatic configuration.
D) The speed for the interface is set to 0, disabling it.

C
Explanation: C) The prefix no in most commands disables any modifications and defaults to automatic settings, like no speed does.