Which of the following are short-run adjustments, and which are long-run adjustments?

a. Wendys builds a new restaurant:

(Click to select)

.

b. Harley-Davidson Corporation hires 200 more production workers:

(Click to select)

.

c. A farmer increases the amount of fertilizer used on his corn crop:

(Click to select)

.

d. An Alcoa aluminum plant adds a third shift of workers:

(Click to select)

.