What legislation mandated that all television stations switch to digital-only broadcasting?

The legislation that mandated all television stations to switch to digital-only broadcasting is the U.S. Deficit Reduction Act. This act included provisions that facilitated the transition from analog to digital television, which was a significant shift in the broadcasting landscape intended to free up spectrum for new communications services and improve the quality of broadcast television.

The move to digital broadcasting allowed for clearer pictures and sound, as well as the possibility of broadcasting multiple channels in the same bandwidth. It was a legislative effort aimed at modernizing the television infrastructure, ensuring that viewers have access to better technology while also optimizing the available spectrum for various uses, including public safety communications and wireless services.

Other options mentioned relate to different aspects of telecommunications and media regulation but do not specifically address the mandate for the transition to digital broadcasting in the way that the U.S. Deficit Reduction Act does.