What is the box in the upper left corner of the worksheet grid that selects all the cells in a worksheet?

It is known as the Select All button.

It is known as the Select All button.

It is known as the Select All button.

It is known as the Select All button.

It is known as the Select All button.

It is known as the Select All button.

It is known as the Select All button.

It is known as the Select All button.

It is known as the Select All button.

It is known as the Select All button.

It is known as the Select All button.