Which pricing technique is known as 'charm pricing' in retail psychology?

Pricing psychology plays a crucial role in retail strategy, influencing consumer perception and purchase decisions. Various psychological pricing tactics are employed by retailers to create specific impressions of value or quality. This poll tests your knowledge of a specific pricing strategy that has been proven effective through extensive market research and consumer psychology studies.

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Setting prices ending in .99 or .95 (e.g., $19.99 instead of $20)
Offering a high-priced premium version to make mid-tier options seem more reasonable
Bundling multiple products together at a slightly reduced total cost
Displaying the original price alongside the sale price to emphasize savings