Advertisers with a product or brand to promote can buy custom solutions, whether or not they sell products in the Amazon store.

The correct answer is True because advertisers looking to promote their products or brands can purchase custom advertising solutions through Amazon, regardless of whether their products are sold in the Amazon store. This flexibility allows brands to leverage Amazon's advertising capabilities to reach potential customers and enhance brand visibility even if they operate outside of Amazon's retail platform. As a result, this statement accurately reflects the inclusivity of Amazon's advertising offerings, making it true that advertisers can access custom solutions without the requirement of selling products on Amazon.