(TCO I) Auditing standards define

(TCO I) Auditing standards define a confirmation as the “process of obtaining and evaluating a direct communication from a third party in response to a request for information about a particular item affecting financial statement assertions.”  What are the two assertions for which confirmation of accounts receivable balances provides primary evidence.  Select one of the below options and EXPLAIN your reasons why you selected that option. 
  (a)  Completeness and Valuation
  (b)  Valuation and Rights and Obligations.
  (c)  Rights and obligations and existence.
  (d)  Existence and Completeness