Which of the Following Are True About Pulse Pressure

Multiple Choice

Which of the following are true about pulse pressure?
1) It normally is between 35 and 40 mm Hg.
2) It is calculated from the 12-lead electrocardiographic printout.
3) It is the difference between the systolic and diastolic pressures.
4) The peripheral pulse is difficult to detect when the pulse pressure falls to below 30 mm Hg.

A) 1 and 4
B) 2 and 3
C) 1, 3, and 4
D) 1, 2, and 3