If ${u_1}$ and ${u_2}$ are the units selected in two systems of measurement and ${n_1}$ and ${n_2}$ are their respective numerical values,then:
- A${n_1}{u_1} = {n_2}{u_2}$
- B${n_1}{u_1} + {n_2}{u_2} = 0$
- C${n_1}{n_2} = {u_1}{u_2}$
- D$({n_1} + {u_1}) = ({n_2} + {u_2})$
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