After running a social media campaign promoting $20$ percent off all at bikes at his shop this upcoming weekend, Jack notices in the comments section that people cannot believe all bikes are $50$ percent off. These comments reveal his mistake, and he quickly edits his post. Which part of the communication process involves assessing the understanding of the message?

The sender encoding a message

The send developing the message

The receivers decoding the message

The feedback loop indicating that the message was wrong