The figure shows a cross section of one turn of the cochlea with letters. P is the upper chamber, which ends at the oval window. Q is the middle chamber, filled with endolymph. R is the lower chamber, which ends at the round window. S is the membrane on which the organ of Corti rests. T is the thin elastic membrane above the hair cells. Which option names them correctly?

Fig. 1: A cross section of one turn of the cochlea with letters. P is the upper fluid filled chamber, which ends at the oval window. Q is the middle chamber, filled with endolymph. R is the lower chamber, which ends at the round window. S is the membrane on which the organ of Corti rests. T is the thin elastic membrane above the hair cells.