Which of the following are commonly used test instruments for WDM system include? (Multiple choice)

Which of the following are commonly used test instruments for WDM system include? (Multiple choice)
A . Optical power meter
B. Optical Spectrum Analyzer
C. Optical Time Domain Reflectometer
D. Data Service Tester
E. 2M BER tester
F. Multimeter

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Answer: ABCDF