What happens when two blocks, one nested inside of the other, both declare variables with the same identifier? (Assume that the outer block declares its variable before the opening left-brace of the inner block.) Select one: a. The "outer" variable is irretrievably lost when the "inner" variable is declared. b. The "outer" variable is hidden while the "inner" variable is in scope. c. A syntax error occurs. d. The "inner" declaration is ignored and the "outer" variable has scope even inside the inner block