Which of the Following Methods Are Effective Ways to Obtain

Which of the following methods are effective ways to obtain a technique chart?
1) Create one using a Supertech® calculator.
2) Request assistance from the equipment manufacturer's technical representative.
3) Hire a radiographer consultant who is experienced in technique chart preparation.

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