The natural numbers ware not sufficient to deal with various equations that mathematicians encountered so some new sets of numbers were defined
Ehole numbers (W) = `{0,1,2,3,4,……….}`
Integers (Z or I) `= (……, -3,-2,-1,1,0,2,3,4,……}`
Even integers :- Intigers divisible by 2, they are expressed as `2n n in Z.`
odd Integers :- Integers not divisible by 2, they are expressed as `2n+1or 2n-1,ninZ.`
If `m^(2)-n^(2)=7,` where m, `n in Z,` then number of ordered pairs (m,n) is

Options

A. 42
B. 56
C. 50
D. none of these