"If you would like to make a valid response, press 4."

He received a valid response: "You didn't lead a trump."

A more valid response to your question might be that where Apple goes, others follow.

The receiver of the request must reply with a valid response to all received requests.

The Republicans see the new seat as a valid response to the city's growing population.

This is a valid response, for most are shelters of some kind with an interior space.

In a List question there are numerous valid responses.

If you get a valid response, the IP is real.

That argument, by the way, I am not rejecting; it is a perfectly valid response.

The survey received 20,762 valid responses in its 2012 edition.