What format seen today represents perhaps the oldest form of advertising and promotion?

Question

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Billboards have been used for advertising and promotion for centuries. The ancient Egyptians used stone carvings and paintings on walls to promote their products and services. Similarly, the Greeks and Romans used outdoor signs to advertise their businesses. Today, billboards remain a popular form of advertising and promotion due to their size, visibility, and cost-effectiveness. Coupons, premiums, and directories are relatively newer forms of advertising compared to billboards.

What Format Seen Today Represents Perhaps the Oldest Form of Advertising