How does joint control differ from control as applied on consolidation?

Oceania Limited acquired 100% of the share capital of Broadwater Limited. Broadwater had total shareholders equity of $500 000. The book values of Broadwater Limiteds assets were: buildings $300 000, machinery $180 000. The fair values of these assets were: buildings $360 000, machinery $200 000. The tax rate is 30%. The fair value of the identifiable net assets is:

a. $580 000 b. $420 000 c. $556 000 d. $444 444