Write the set builder form `A = {-1,1}`

Options

A. `A= {x:x ` is root of the equatin `x ^(2) =1}`
B. `A= {x:x` is real number }
C. `A={x:x` is a root of the equation `x ^(2) +1 =0}`
D. `A= {x:x` is an integer}

Answer

A