Which of the following is an example of captive$-$product pricing?

A customer buys Microsoft Word, Excel and PowerPoint as a combined package.

Tiffany's prices its jewelry at higher prices than the value of the precious metals used in its products because Tiffany's knows customers will pay the higher prices for the Tiffany's brand name.

When a consumer buys a razor, he or she must buy razor blade replacements for the same make and model of the razor.

The greater the amount of oats purchased, the lower the price per pound of oats