On an ONS 15454 node you can tunnel a(n) ().
A、 SDH circuit over a SONET network delivering it as an SDH signal
B、 SDH circuit over a SONET network delivering it as a SONET signal
C、 SONET circuit over an SDH network delivering it as an SDH signal
D、 SONET circuit over an SDH network delivering it as a SONET signal