How did the Allies react when they discovered the Nazi concentration camps?

Responses

They denounced and criticized the camps.
They denounced and criticized the camps.

They sent in spies to infiltrate the camps.
They sent in spies to infiltrate the camps.

They negotiated with Hitler to end the mass killings at the camps.
They negotiated with Hitler to end the mass killings at the camps.

They initiated immediate air raids to destroy the camps.

They were shocked and horrified by the atrocities committed in the camps, and immediately set out to liberate and provide aid to the survivors. They also took steps to document the crimes committed and hold the perpetrators accountable at the Nuremberg Trials.