Meta keywords- Use words or phrases?

Question

I know the relevance of meta keywords is little to none, but my client wants them. Moreover, they gave me a list of key phrases. Should I be inserting key phrases separated by commas, even if they repeat certain key words, or should I be including each key word exactly once, and not use phrases at all?

<meta name="keywords" content="big red cars, small blue cars, medium yellow cars">

OR

<meta name="keywords" content="cars, big, small, red, yellow, blue">

Answer 1

Use the complete phrases.

Otherwise, when exact phrases are used for search, your customer will not be happy with you.