In the following payment terms, ( ) is the safest term to the seller.【单选题】

In the following payment terms, ( ) is the safest term to the seller.

A. Payment against documents, at 30 days after sight

B. Payment by T/T, at 30 days after arrival of goods

C. Payment against documents, at 30 days from the date of B/L

D. Payment by acceptance L/C, at 30 days after sight