Which of the Following Practices Will Extend the Life of the X-Ray

Multiple Choice

Which of the following practices will extend the life of the x-ray tube?
1) Use low mA and longer exposure time.
2) Warm up the tube as appropriate.
3) Hold down the rotor button for a long time,to keep the tube warmed up.

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