The QRS Complex Is Normally ______ Seconds in Duration and the Mean

Multiple Choice

The QRS complex is normally ______ seconds in duration and the mean QRS axis lies between __________.

A) greater than 0.12, +90F $\degree$ and +180 $\degree$
B) less than 0.10, 0 $\degree$ and +90 $\degree$
C) less than 0.10, 0 $\degree$ and +30 $\degree$
D) between 0.12 and 0.20, 0 $\degree$ and +90 $\degree$