The question asks for the specific term used when an advertisement is broadcast at the same time across multiple radio and/or television channels.

Defining the Advertising Method

This technique is designed to maximize reach and impact by ensuring the audience encounters the same advertisement across various platforms simultaneously, preventing them from easily avoiding it. This is often used during major events or campaign launches.

Identifying the Correct Term: Road-block

The advertising method described is known as a Road-block. This strategy involves purchasing ad time on all desired channels or stations during a specific, often high-viewership, time slot. Essentially, it blocks the audience from switching channels to avoid the ad, as it appears everywhere.

Evaluating Other Options

• Black-out: Refers to the suspension or prohibition of advertising, often due to regulations or specific events.
• Consolidation: Typically relates to merging companies or media properties, not a specific advertising broadcast technique.
• Cornering: A market strategy involving gaining control over supply; not directly related to simultaneous ad broadcasting.

Therefore, the simultaneous broadcasting of advertisements across multiple stations aligns directly with the definition of a Road-block.