Select the best choice from the following to answer questions 1 and 2. 

1. An increase in service volume will have the following effects:
a. Increase unit variable cost and decrease unit fixed cost
b. Unit variable cost remains constant and unit fixed cost remains constant 
c. Decrease unit variable cost and unit fixed cost remains constant 
d. Unit variable cost remains constant and unit fixed costs decrease 

2. Which one of the following is a name for the range of service volume over which an organization expects to operate?
a. Mixed range 258
b. Variable range 
c. Relevant range