Which of the following statements is valid?

a. when a calf is born, a gain arising from change in fair value less cost to sell due to price change is recognized in profit or loss

b. when a calf is born, a gain arising from change in fair value less cost to sell due to price change is recognized in other comprehensive income.

c. when a calf is born, a gain arising from change in fair value less cost to sell due to physical change is recognized in profit or loss

d. When a calf is born, a gain arising from change in fair value less cost to sell due to physical change is recognized in other comprehensive income

(Please insert your explanation. Thank you)

(This is about biological asset)