https://foxoyo.com/mcq/107044/consider-the-following-rules-in-fortran-a-signed-or-unsigned-real-variable-name-or-a-real-constant-is-a-real-expressiontwo-real-expressions-connected-by-an-arithmetic-operator-is-a-real-expressiona-real-variable-or-constant-exponential-by-an-integer-constant-or-integer-variable-is-not-valid-which-of-the-above-are-correct