Select ‘NORTH’, CUSTOMER From CUST_DTLS Where REGION = ‘N’ Order By CUSTOMER Union Select ‘EAST’, CUSTOMER From CUST_DTLS Where REGION = ‘E’ Order By CUSTOMER?

(A) Has an error – the string should be in double quotes
(B) Has an error – ORDER BY clause
(C) Does not have an error
(D) Has an error – the string in single quotes ‘NORTH’ and ‘SOUTH’