“If you think education is expensive and time-consuming - try ignorance”. What does this phrase mean?[Fill in the blank]单项选择题

A
a. If adequate time and money are kept aside for training, then only ignorant users will have difficulty using the system, but expert users will be fine
B
b. All users are ignorant when using new systems, so they must be trained so that they can use the system
C
c. If adequate time and money are not kept aside for training, then users will have difficulty using the system and the resulting problems could be very costly
D
d. Only ignorant people say that training is very expensive and time-consuming, when in reality it can be done by just giving the users a well designed user manual
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