When a checkbox’s . . . . . . . . property is set to true, it can both accept and display multiple lines of text.

The correct answer is A. Multiline Property.

A checkbox is a type of control that allows the user to select or deselect an option. The Multiline property of a checkbox determines whether the checkbox can display multiple lines of text. If the Multiline property is set to true, the checkbox can display multiple lines of text. If the Multiline property is set to false, the checkbox can only display one line of text.

The ReadOnly property of a checkbox determines whether the user can edit the text of the checkbox. If the ReadOnly property is set to true, the user cannot edit the text of the checkbox. If the ReadOnly property is set to false, the user can edit the text of the checkbox.

The ReadWrite property of a checkbox determines whether the user can both read and write the text of the checkbox. If the ReadWrite property is set to true, the user can both read and write the text of the checkbox. If the ReadWrite property is set to false, the user can only read the text of the checkbox.

The ScrollBars property of a checkbox determines whether the checkbox has scrollbars. If the ScrollBars property is set to true, the checkbox has scrollbars. If the ScrollBars property is set to false, the checkbox does not have scrollbars.