To determine whether a character entered is a letter of the alphabet, use the function. s. a. isdigit b. fromkeyboard c. alpaok d. isalpha e. None of these function will change a character argument from lowercase to uppercase. a. isupper b. toupper c. tolarge d. fromlower e. None of these What is the output of the following statement? 10. cout << tolower (toupper (Z) < endl: a. uppercase 2 b. lowercase z c. a
