Nystagmus.. A nurse conducting an eye examination notes that the client exhibits rapid, involuntary oscillating movements of the eyeball when looking at the nurse

A nurse conducting an eye examination notes that the client exhibits rapid, involuntary oscillating movements of the eyeball when looking at the nurse.
The nurse documents this finding as:

a- Unequal pupils

b- Consensual response

c- Photophobia

d- Nystagmus***