You are able to drag a cell to a new location by pointing to the cell border until the pointer displays a arrow, and then dragging the cell to the new location. a. three-headed b. four-headed c. single d. double-headed

The answer is the option B. four-headed arrow.

The displayed arrow is similar to this, but smaller:
        ↑
    ←     →
        ↓

The four headed arrow appears as soon as you point the cell that you want to move.

To drag the cell (its content and format) to a new location you have to click on the left button of the mouse and move to the new location, where you want to move the cell. If the new location is empty, the cell is dragged as soon as you unclick the lef button.

If the new location is occupied the dialog box will ask you whether you want to replace the content.

Not so sure about this sorry

The answer is length!