How did the Allies try to conceal the true location of the D-Day landings?

Question

The Allies worked with Soviet spies to spread false information using an Enigma code
The Allies set up a dummy, or fake, army base with its own headquarters and equipment
The Allies only trained in the US before invading France
The Allies used a newly developed radar system to show the invasion forces heading to a different location

Answer 1

The Allies set up a dummy, or fake, army base with its own headquarters and equipment.