Which of the following is a part of the hindbrain?

All of these

The correct answer is Option (4) - All of these

The hindbrain is the lowermost part of the brainstem. It consists of two regions:

1. the myelencephalon, which includes the medulla

2. the metencephalon, which includes the pons and cerebellum.

It bridges the brain with the spinal cord. Function includes respiratory rhythm, motor activity, sleep, and wakefulness etc.