Which of the following data changes cannot be undone using the rollback command?

Most databases are created and manipulated using relational database management systems.

Answer the following statement true (T) or false (F)

In the accompanying figure, the original formula =B5*C2 works correctly in cell C5. When it is copied and pasted into cell C8, why do the hash marks appear?

A. The copied formula does not refer to the correct cells and produces a result that is too large to fit in the cell. B. The copied formula contains a cell which is blank. C. The copied formula contains a cell with a label. D. none of the above