After the project is delivered, operation and maintenance costs will continue to be incurred. Which of the following items are costs incurred during operation and maintenance? (Multiple choice)

After the project is delivered, operation and maintenance costs will continue to be incurred. Which of the following items are costs incurred during operation and maintenance? (Multiple choice)
A . Energy costs
B . Route suggestion fee
C . Line rental fee
D . Equipment depreciation expenses
E . Staff costs

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Answer: ACE