How can product and service guarantees create an agency problem between the firm and its consumers?

Multiple choices are:

the firm has the option to repair rather than replace a defective product
		the firm has the option to not honor the guarantee
		the firm has the option to recall defective products
		the firm has the option to refund the price of the product rather than provide a fully functioning product
		A and B
		A and C
		A and D
		B and C
		B and D
		C and D
		all but A
		all but B
		all but C
		all but D
		all are true