Let W be the set of all vectors of the form shown on the right, where a, b, and c represent arbitrary real numbers. Find a set S of vectors that spans W or give an example or an explanation to show that W is not a vector space. 5a-4b 2b + 6C 7C + 2a 8b d Select the correct choice and fill in the answer box as needed to complete your choice. O A. A spanning set is S= (Use a comma to separate answers as needed.) OB. There is no spanning set of W because W does not contain the zero vector. O C. There is no spanning set of W because W is not closed under scalar multiplication. D. There is no spanning set of W because W is not closed under vector addition