public static boolean isValidOption(String option) {
		if (GRE_OPTION_A.equals(option) || GRE_OPTION_B.equals(option)
				|| GRE_OPTION_C.equals(option) || GRE_OPTION_D.equals(option)
				|| GRE_OPTION_E.equals(option)) {
			return true;
		}
		return false;
	}