Describe the difference between an inertial and non-inertial frame of reference

A) In an inertial frame, there is no acceleration; in a non-inertial frame, there is acceleration
B) In an inertial frame, there is acceleration; in a non-inertial frame, there is no acceleration
C) In an inertial frame, there is constant velocity; in a non-inertial frame, there is acceleration
D) In an inertial frame, there is no velocity; in a non-inertial frame, there is constant velocity