Read the following statement carefully and choose how many of them are incorrect

a. Afferent neuron transmits signal of CNS.

b. The choroid layer is bluish color and is present over the posterior two-thirds of the eyeball.

c. Olfactory bulbs are an extension of the hypothalamus

d. Medulla oblongata have centre to control excretion, circulation, and gastric secretion.

1. One

2. Two

3. Three

4. Four