Considering the information provided, what is the correct date on which the contract was concluded between Vitor and Videolog Ltda? Vitor consulte...

Considering the information provided, what is the correct date on which the contract was concluded between Vitor and Videolog Ltda?

Vitor consulted Videolog Ltda. about the commercialization of a specific type of video camera.
Vitor sent an email to Videolog on October 19th inquiring about the price of each camera.
Videolog replied to Vitor's email on October 22nd, informing the price of each camera.
Vitor sent another email on October 25th, inquiring about the possibility of a discount if he bought four cameras and ordering the products for delivery in 30 days.
Videolog replied affirmatively to Vitor's email on October 27th regarding the discount and delivery in 30 days, and Vitor viewed the email on October 30th.
a) October 19th;
b) October 22nd;
c) October 25th;
d) October 27th;
e) October 30th.