In the PITP application of OLT+MDU networking, which of the following statements is incorrect?

In the PITP application of OLT+MDU networking, which of the following statements is incorrect?
A . When PITP is enabled only on the OLT, only the PON port information of the OLT can be used.
B . When PITP is enabled only on the MDU, only the user port information of the MDU can be carried.
C . If PITP is enabled on both the OLT and the MDU, the PON information and MDU port information are also marked.
D . If PITP is enabled on both the OLT and the MDU, you need to pass a switch (pitp permit-forwarding service-port X) on the OL
E . When this switch is enabled, it carries the OLT PON port information.

Answer: C