In the case of Huawei router, what is the "-i" parameter in a Ping command issued on a VRP operating system used to set?

In the case of Huawei router, what is the "-i" parameter in a Ping command issued on a VRP operating system used to set?

A. Interface for sending an Echo Request packet B. Source IP address for sending an Echo Request packet C. Interface for receiving an Echo Reply packet D. Destination IP address for receiving an Echo Reply packet