Click the Exhibit button. What is the maximum allowable loss budget between the ONS 15216 Mux (left side) composite output and the ONS 15216 Demux (right side) composite input, <br /> with the optical values given in the exhibit? (Assume the worst case loss of 4.5 dB for 15216 200 GHz Mux/Demux and ignore power penalties or extra margin.)  ()<br /> <img src="https://nimg.ppkao.com/2018-08/gelingxia/2018080114073960161.jpg?sign=4df4ffa281159b55040e4ff72bd64ab0&t=62d0bc80" />
A、 15 dB
B、 17 dB
C、 21 dB
D、 26 dB
E、 27 dB