1. English Language and Literature
2. Language
3. 16155

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Correct punctuation

a) The new machine, which I haven't even learned to operate yet,is out of order.
b) The new machine, which I haven't even learned to operate yet is out of order.
c) The new machine which I haven't even learned to operate yet,is out of order.
d) The new machine which I haven't even learned, to operate yet, is out of order.

I would think a)