【单选题】

You can do the test in two different ways -- either with the Central Maintenance Computer System via the MCDU, like you have probably learned already, or with a test switch on the VOR receiver in the avionics compartment.

A、Two controversial ways can be chosen to do the test, either with the Central Maintenance Computer System through a the MCDU, like you have probably learned already, and with a test switch on the VOR receiver in the avionics compartment.
B、You can do the test following procedures -- with the Central Maintenance Computer System by the MCDU, you have probably learned already, and with a test switch on the VOR receiver in the avionics compartment.
C、The test can be done in either way below-- using the Central Maintenance Computer System via the MCDU, as you have probably already learned, or using a test switch on the VOR receiver in the avionics compartment.