Indicate which one item in each of the following groups of items of evidence you would consider to be of superior reliability, and briefly explain why. 

1 In support of the recorded cost of purchased raw materials: 

a. Standard costs used by the company 

b. A supplier's quotation list on file in the purchasing department 

c. The actual invoices representing materials actually purchased 

2. How would your answer to/differ if you were attempting to support the ending inventory of raw materials rather than purchases? 

3. In support of the valuation of a marketable security held by the company:

a. The canceled check used to pay for the security 

b. The Wall Street Journal dated the last day of the company's fiscal year 

c. Both a and b 

4. How would your answer to 3 differ if you were attempting to support long-term investments rather than marketable securities?