Which two statemets are true?

A.
DPT/RPR uses a bi-directional ring consisting of two symmetric counter rotating fibre rings.

B.
DPT/RPR is defined in the IEEE 802.17 standard and it uses Token Bucket system to avoid
collisions on the fiber.

C.
DPT/RPR can be deployed in the Core of the SP networks where point-to-point POS links are
used to make best use of the Bandwidth.

D.
In DPT/RPR rings, data packets can be sent in one direction (downstream) and the
corresponding control packets in the opposite direction (upstream), thus using both fibres
concurrently to maximise bandwidth.