What does it mean when the override test channel box is channel for a channel In the marketing channel processing rules?

A product was viewed on two different pages and was added to the cart from one of the pages.
Below are the product syntax used for each page

If the product was checked out and purchased for $100, how might revenue be attribute to eVar2 if merchandising is enabled? Select two.

Which tools can be used to upload offline data such as orders email send descriptive information for tracking code, and open data? Select three.

A visitor interacted with your website on 3 visiting the same device and web browser. The source query string parameter is captured into eVar5.
Visit#1.
The visitor can to the website by clicking on Facebook ad with the query string parameter source=xyz123 set in the URL During this visit they added a quantity of one of product SKU#123ABC with a cost of $99.99 to their can filled out a contact from on the site that resulted in success event1 being set.
Visit#2
The visitor returned to the website by clicking a link containing source=567 they received In their email. During this visits they added two products of sk#555AAA with an individual cost of $50.00 to their shopping cart.
Visit #3
They retirement to the website by typing the URL of the website homepage directly into the address bar can completed the purchase for both items.
What is the correct syntax of the s.products string upon purchase

Use the two sequential request to answer the question below.

Assume custom eVar persist throughout the visit
What conclusion you draw from the sequential image request above? Select two.