To lock all of the controls on a form during design time, ______________.

a. left-click an empty spot on the form, then click Locked in the properties window
b. right-click an empty spot on the form, then select the Lock Controls option from the pop-up menu
c. click Window on the Menu Bar, then click Lock Controls
d right-click the form, then click the lock controls icon on the toolbar

b. right-click an empty spot on the form, then select the Lock Controls option from the pop-up menu