Clicking the ________ & Center button merges multiple adjacent cells into one cell, and centers its contents

If a cell contains =$N$21 and two new columns are inserted in front of column N and three rows are inserted above row 21, what happens to the =$N$21?

A) It remains =$N$21 B) It becomes =$L$18 C) It becomes =$Q$23 D) It becomes =$P$24

Which of the following is NOT a built-in method of the Exception PHP class?

a. get String() b. get Trace() c. get Code() d. to String()