Find the domain of the function ( f(x) = 1/x-2 + 1/x+2 ).
a) ( x (-fty, -2) ∪ (-2, 2) ∪ (2, fty) )
b) ( x (-fty, -2) ∪ (-2, 2] ∪ [2, fty) )
c) ( x (-fty, -2) ∪ (-2, 2) ∪ (2, fty) )
d) ( x (-fty, -2) ∪ (-2, 2) ∪ (2, fty) )