Apassword must consist of 16 characters. each character can be a digit(0-9), an uppercase or lowercase letter (a-z, a-z) or one out of 10 specialcharacters. how many valid passwords are there? if you have forgotten your password, but can test 1 trillion passwords persecond, how much time would you require to find the password in theworst-case scenario that your forgotten password is the last one tested? give the answer in years, rounded to the nearest power of 10.