Mark the option/button in the following image of the Format tab on which you will click to apply the
effect to a textbox.

Answer:

Explanation:
A text box is a control that is rectangular in shape. A text box has a border that separates it from the
rest of the interface. A user can type the text inside a text box and resize it also according to his
need. Take the following steps to add shape effects to a text box:
1.Select the text box.