What values are accessible in the child flow after a web client submits a request to http://localhost:8081/order? col or = red?

Refer to the exhibits.

The main flow contains an HTTP Request. The HTTP Listeners and HTTP Request use default configurations.

What values are accessible in the child flow after a web client submits a request to http://localhost:8081/order? col or = red?
A . payload
B . payload quantity var
C . payload
color query param
D . payload
quantity var color query param

Answer: A