Under a municipal revenue bond rate covenant, rates must be set to cover all :

D. optional sinking fund deposits

Explanation:

The revenue bond rate convenants needed that the rate should be set for the level that could be enough for covering a facility operation and maintenance also the debt service cost is considered

But there is no requirement to cover the option sinking fund or the deposit with respect to the reserve fund

Therefore according to the given case, the option D should be chosen

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