QUESTION 6 This function accepts a pointer to a string as an argument, and it returns the length of the string (no including the null terminator]. O numchar o strlength O strlen O None of these QUESTION 7 This function will return true if its argument is a printable character other than a digit, letter, or space. O isprin O ispunc O ischar O isnotdls O None of these QUESTION 8 To change a character argument from lower case to upper case, use this furnction O isuppe O toupper O tolarge O fromlower O None of these QUESTION 9 To change a lower case character to an upper case car, use this funictian O itoa O ltou O toupper O None of these QUESTION 10 To deline a C-string that will store students' last names of up to 25 characters in length, which is an appropriate statemen o char lastName[251 O string lastName 251 o char lastName[26 O string lastName 241 O None of these QUESTION 11 To determine whether a character is whitespace, use this functian O iswhite O isspace O isblank O None of these