Reply to "Past perfect or past simple"

So which do you think is OK in the following sentences:

1-"I waited at the garage until the mechanic repaired my car."

2-"I waited at the garage until the mechanic had repaired my car."

3-"I had waited at the garage until the mechanic repaired my car."

4-"I had waited at the garage until the mechanic had repaired my car."

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