Asentinel value and signals that there are no more values to be entered. a. is a different data type than the values being processed b. is a special value that cannot be mistaken as a member of the list c. indicates the start of a list d. guards the list

i think its controle not shift

the today function returns a valid value without any arguments.

the today function returns the current date based on the computer's date setting and formatted as a date. today takes no parameters, but requires that you use empty parentheses