The HOD of ophthalmology asks the resident to plot the electroretinography(ERG) curves in patients of retinitis pigmentosa. Abnormality in which of the following waves of ERG record will be observed by in the cohort of patients?

a) Subnormal b waves - late cases of RP
b) Extinguished response - seen in early stages of RP
c) Subnormal b waves - early cases of RP
d) Negative response indicates - Disturbance in retinal circulation

Options 
1) A and B are correct
2) A, C, D are correct
3) C and D are correct
4) All are correct

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