Conjunctions and modal verbs

Question

What is the correct version?

They have contacted me and discussed

or

They have contacted me and have discussed

Answer 1

I feel that both are correct. It depends on the level of understanding and assertion. If you wish to just make a statement (and be brief), then (1)

They have contacted me and discussed

If you wish to be clear, then (2)

They have contacted me and have discussed

And if you wish to cover all your bases, then

They have both contacted me and have discussed

In any case, all options are grammatically correct.

Answer 2

In such sentences, where a series of actions is presented (and the subject of the actions is the same), subject and auxiliary verb are normally not repeated after the first action.

She should go to home, take her cell phone, and return at work in 30 minutes. She cannot possibly return in time.
She was having brunch, talking on the phone, and keeping an eye on his son; I am not surprised she didn't notice her son moved away.
They have contacted me and discussed.

I don't see anything wrong with they have contacted me and have discussed, though.

Answer 3

Parallelism says that the pattern followed with the first verb should be repeated with the following verbs as well. Hence, the second form of the sentence is correct, i.e., They have contacted me and have discussed [this with me.]