Scenario: Wang's Techno Toys

Ann Wang has been successfully running Wang's Techno Toys that sells high$-$tech toys in the domestic market. Continually increasing and stiff competition at home has now forced Wang's Techno Toys to enter international markets through direct exports.

Which of the following methods of export$/$import financing is Techno Toys' bank using if it acts as an intermediary without accepting financial risk?

Question $5$ options:

$1)$

documentary collection

$2)$

buyback

$3)$

letter of credit

$4)$

advance payment