Transaction question I have a question.

c stands for Commit, a stands for Abort, T is a transaction (db Transaction) 

Is the following sentence true?

either c or a belong to T


In my opinion the sentence is true since if you have Abort you cannot Commit...and also the opposite is true.

So if you have c you cannot have a, a mutual exclusion.

Sorry to bother you but my teacher said I made a mistake 

Thanks
Moved from comment to answer

I think 'belong' is a wrong word here. It usually says that transaction ends with commit or rollback. Group of DML statements belong to transaction; commit/rollback is a way to finish transaction...emphasized text