Which of the following statements about fiber optics are wrong ? (Multiple Choice)

Which of the following statements about fiber optics are wrong ? (Multiple Choice)
A . Multimode fiber can transmit light with different wavelengths and different incident angles
B . The core of multimode fiber is thinner
C . When multimode fiber is used, the maximum transmission distance of the signal is longer than that of single mode fiber
D . The cost of multimode fiber is lower than that of single mode fiber

Answer: BC