Which of the following statements are true? (Select all that apply.)

A.
The ISCHANGED function compares the value of a field with its previous value and
returns TRUE if the values are different. If the values are the same, this function returns
FALSE.

B.
The ISNUMBER function determines if a text value is a number and returns TRUE if it is;
otherwise, it returns FALSE.

C.
The ISNEW function compares a text field to a regular expression