The Difference Between Wenckebach and CHB Is That

Multiple Choice

The difference between Wenckebach and CHB is that:

A) CHB has a regular R-R,whereas Wenckebach is irregular.
B) CHB has a constant PRI,whereas in Wenckebach it gets progressively longer.
C) CHB has an irregular P-P interval,whereas it's regular in Wenckebach.
D) CHB has more P waves than QRS complexes,whereas Wenckebach always has one P wave for every QRS complex.