Which of the below mentioned options is not a possible reason for rejection?

Explanations:

If the access key to connect is wrong, the SSH connection will fail, but this would typically result in an authentication error, not a connection timeout.

If the security group is not configured properly, it could block inbound traffic (SSH) and lead to a connection timeout.

If the private key used to launch the instance is not correct, the SSH connection would fail due to authentication errors, but not necessarily a timeout.

A heavily loaded CPU would not typically cause a connection timeout; it may slow down the instance, but a timeout is more likely to be caused by network issues, not CPU load.