Sentence Correction (SC) | Re: The new house's front door is secured by an electronic lock

E is incorrect for two reason:

Intent is saying although this feature -- good thing-- but --bad thing.
Not only , but also doesn't seem right here. because these two should be on the same side.

Second, may ___may prevent. Difference in meaning.

I have a question with sentence structure:
this feature allows X, but also Y.

Can we write a sentence with but also (without NOT ONLY)?

Narenn
...

---