Choose the most appropriate option to change the voice (active / passive) form of the given sentence.
My grandmother believes that drinking a glass of milk at bedtime is essential for health.

It is believed by my grandmother that drinking a glass of milk at bedtime is essential for health.

It is being believed by my grandmother that drinking a glass of milk at bedtime is essential for health..

It will have been believed by my grandmother that drinking a glass of milk at bedtime is essential for health.

It has been believed by my grandmother that drinking a glass of milk at bedtime is essential for health