Parent Co. acquired 60% of the common stock of Sub Co. in exchange for $120 million of Parent Co. Common Stock. At the date of the acquisition, the fair value of Subs identifiable total assets were $230 million, the fair value of Subs identifiable total liabilities were $180 million. At the acquisition date, the following amount of goodwill must have been recorded:

a. $90 million

b. $150 million

c. $80 million d. $70 million