If U = {all positive integers} and A = {x|x ∈ U and x is an odd positive integer}, which describes Ac?Ac = {x|x ∈ U and is a negative integer}Ac = {x|x ∈ U and is zero}Ac = {x|x ∈ U and is not an integer}Ac = {x|x ∈ U and is an even positive integer}