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The number of integral values of a for w...

The number of integral values of a for which the quadratic equation `(x+a)(x+1991)+1=0` has integral roots are a. 3 b. 0 c. 1 d. 2

A

Number of integral values of a are 2

B

Both the integgral value3s of a is divisible by 2

C

one of the integral value of a is divisible by 2

D

If the integral values of a are `alpha&beta` such that `alpha gtbeta then alpha-beta=4`

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