For each response for A/R confirmation requests below, describe the proper action to be taken to determine A/R balance is misstated (The company's fiscal year end is December 31).

a. "We mailed the check on December 30."

b. "We returned those goods on November 30". You have been able to determine that the goods were received by the client on December 20, but not recorded until January 3.

c. "We are satisfied with the company and plan to purchase from them in the future."

d. "We did not receive the goods until January 2 of year 2."

e. The customer did not respond to a positive confirmation.

f. The customer did not respond to a negative confirmation