HELP ME ASAP! TY 30 POINTS AND BRAINLIST

Which statement is true?

In a series circuit, the current changes throughout the wiring and the brightness stayed the same when adding more light bulbs. In a parallel circuit, the current stays the same throughout and the brightness of the light bulbs changes when more are added.

In a series circuit, the current stays the same throughout the wiring and the brightness stayed the same when adding more light bulbs. In a parallel circuit, the current changes throughout and the brightness of the light bulbs changes when more are added.

In a series circuit, the current changes throughout the wiring and the brightness changes when adding more light bulbs. In a parallel circuit, the current stays the same throughout and the brightness of the light bulbs stay the same when more are added.

In a series circuit, the current stays the same throughout the wiring and the brightness changes when adding more light bulbs. In a parallel circuit, the current changes throughout and the brightness of the light bulbs stays the same when more are added.

Why would knowing the characteristics of circuits be important in designing electrical circuits? Be specific.