Определите к какому виду документа относится представленный ниже отрывок:

Dear Sirs,
With reference to your enquiry of May 11-th we confirm that we manufacture the equipment you are interested in.
We can supply you with our latest catalogue and leaflets where you will find all the technical and commercial information. The currency of payment can be the subject of further negotiations.
We look forward to receiving your order in the near future.


Варианты ответов:

1. CV.
2. Offer.
3. Enquiry.
4. Covering letter.