What is the subject of a survey called?

For example, the subject of an interview is an interviewee.

So, I was wondering what the subject of a survey might be.

Solution 1:

despite the fact that most of us are inundated with surveys and they most likely use such a word in their communication, all I can think of is:

respondent.

(all the obvious constructions just don't sound like they are used despite their 'correctness'.)

Solution 2:

Since someone who conducts and survey is a surveyor then someone or something being surveyed is the surveyed.

Similarly to how the object of a tormentor is the tormented.

Solution 3:

Simply subject of survey. Or you can use surveyed object. There does not seem to be any one-word synonym for it. If you don't consider survivor as one :)