How is the ButtonGroup class used?

Question $61$Select one or more:

a$.$

A ButtonGroup object is used with a set of radio buttons $($or radio button menu items$),$ to make sure that at most one of the radio buttons in the group can be selected at any given time.

b$.$

To use the ButtonGroup class, you have to create a ButtonGroup object, grp$.$ Then each radio button, rb$,$ that is supposed to be part of the group is added to the group by calling grp$.$add$($rb$).$ Nothing further needs to be done with the ButtonGroup object.

c$.$

Creating a set of buttons with the same ButtonGroup object means that turning $"$on$"$ one of those buttons turns on all other buttons in the group.

d$.$

Typically a button group contains instances of JRadioButton, JRadioButtonMenuItem, or JToggleButton.