When doing a time-series comparison, an analyst would do which of the following? Select one: a. Hold firm-specific factors constant and examine the firm’s strategy over time. b. Examine firm-specific...

When doing a time-series comparison, an analyst would do which of the following?
Select one:
a. Hold firm-specific factors constant and examine the firm’s strategy over time.
b. Examine firm-specific factors over time and hold the firm’s strategy constant.
c. Examine the performance of a firm in its industry and hold industry-level factors constant.
d. All of given choices.