Which Circuit are all three lamps lit at their normal brightness?

Three 240 V lamps, of Different power ratings 40 W, 60 W and a 100 W, are connected in 1) Parallel, where all three lamps are parallel to each other. 2) All three lamps are connected in series. 3) 2 Lamps of 40 W and 60 W are connected in series but the 100 W lamp is connected in parallel to the 40 W and 60 W lamp. Which Circuit (1-3) are all three lamps lit at their normal brightness?

And what determines the NORMAL BRIGHTNESS.