Under what conditions (s) is the magnitude of average velocity of an object equal to its average speed ?

The magnitude of average velocity is equal to the average speed when a particle moves:-

Assertion: The average velocity of a particle is zero in a time interval. It is possible that the instantaneous acceleration is never zero in the interval. Reason: The magnitude of average velocity in an interval is equal to its average speed in that interval.

Are the magnitudes of average velocity and average speed equal?

Under what condition is the average velocity equal to instantaneous velocity ?

Under what condition is the average velocity equal to instantaneous velocity?

Statement-2: It is possible when the direction of motion keeps changing. Statement-1: Magnitude of average velocity is equal to average speed, if velocity is constant.

Can a body have a. Zero instantaneous velocity and yet be accelerating? b. Zero average speed but non-zero average velocity? c. Negative acceleration and yet be speeding up? d. Magnitude of average velocity be equal to average speed ?