A patient asks the pharmacy technician to explain the difference between stable and unstable angina. ...

A patient asks the pharmacy technician to explain the difference between stable and unstable angina. What is the best response by the pharmacy technician?

1.   "Stable angina is predictable in its frequency, intensity, and duration. Unstable angina is when angina episodes become more frequent or severe, and occur during periods of rest."
2.   "Unstable angina is caused by spasms of the coronary arteries. Stable angina is when angina episodes become more frequent or severe, and occur during periods of rest."
3.   "Unstable angina is predictable in its frequency, intensity, and duration. Stable angina is when angina episodes become more frequent or severe, and occur during periods of rest."
4.   "Stable angina is caused by spasms of the coronary arteries. Unstable angina is when angina episodes become more frequent or severe, and occur during periods of rest."