Which are the bytes in the SONET Line Overhead that point to the start of the floating Synchronous Payload Envelope?

Which are the bytes in the SONET Line Overhead that point to the start of the floating
Synchronous Payload Envelope?

A.
A1, A2

B.
B1, B2

C.
H1, H2

D.
K1,K2

E.
J0, J1