Explanation:
Wide: If a brand has multiple products then we say the product line is wider. The startup company might have only one product in most of the cases.
Length: Having sub-products in the wider product line is called the length of the product.
Depth: Refers to the total number of variations for each product. Eg. Am ice cream can have different flavors.
Consistency: Related product with mix. Eg. A hair dye and a guide to make hair glow. One will be edible and other not edible.