Consider the following statements about elephants and tell which of the following statements are true?

A. Elephants do not rest very much, they sleep 2 to 4 hours only in a day.

B. An adult elephant can eat more than 200 kg of leaves and twigs in a day.

C. They love to play with mud and water, the mud keeps their skin cool.

D. In the elephant herd, the oldest female elephant decides everything.