A student uses the \(2\)-dimensional particulate model shown to represent a small region of an \(\text{MgO(s)}\) crystal before mechanical stress. A rapid shear force then displaces the upper \(2\) rows to the right by exactly \(1\) nearest-neighbor spacing while the lower \(2\) rows remain fixed. During the displacement, the ions do not diffuse or exchange identities. Which particulate diagram best represents the crystal region as brittle cleavage begins?