The above ECG comes from a dual-chamber pacemaker programmed to a base rate of 60 ppm, a paced AV delay of 200 ms, a sensed AV delay of 150 ms, and a PVARP of 250 ms. Knowing that information, what...

The above ECG comes from a dual-chamber pacemaker programmed to a base rate of 60 ppm,

a paced AV delay of 200 ms, a sensed AV delay of 150 ms, and a PVARP of 250 ms. Knowing that information, what kind of timing does this pacemaker use?

A Modified atrial-based timing.

B True atrial-based timing.

C Ventricular-based timing.

D There is not enough information to tell.