People think the logo is the brand but that is not a true logo is the just face of the brand. They also think the company is the brand that is also the not correct answer. The brand is basically trusted between the consumer and the products.

For example, I am wearing two company shoes one is Company  A another is Company B. But the customer always compares which one is comfortable in wearing, which one always good looking, which one I can run a long period of time, also compare price etc. Suppose If I found Company B always good in our comparing criteria then we make a Blind Trust in that brand products because he always gives better results. 

So trust is the brand between customer and product.