The Student Health Center Employs One Doctor, Three Nurses, and Several

The student health center employs one doctor, three nurses, and several other employees. How would you classify (1) the nurses' salary and (2) film and other materials used in radiology to take X-rays? Assume the activity is the number of students visiting the health center.
$\begin{array} {cc } & \text { Nurse's Salaries } & \text { Film and Other Materials Used in Radology } \\\end{array}$
A. $\begin{array} {cc } & \text { Fixed cost } &&&&&&&&\text { Fixed cost } \\\end{array}$
B. $\begin{array} {cc } & \text { Fixed cost } &&&&&&&& \text { Variable cost } \\\end{array}$
C. $\begin{array} {cc } & \text { Variable cost } &&&&&&& \text { Fixed cost } \\\end{array}$
D. $\begin{array} {cc } & \text { Variable cost } &&&&&&& \text { Variable cost } \\\end{array}$

A) Option A
B) Option B
C) Option C
D) Option D