The correct option that must be placed between coordinate adjectives is "commas".
The correct option that must be placed between coordinate adjectives is "commas." When using multiple coordinate adjectives to describe a noun, commas should be used to separate the adjectives. For example, if you want to describe a beautiful, tall building, you would use a comma between "beautiful" and "tall" like this: a beautiful, tall building. This helps clarify that both adjectives are equally describing the noun.
