Use the BNA Tax and Accounting Center States tab to answer the following questions:
a. Is there a portfolio for each state? Which state has the most portfolios?
b. Generally, what are the portfolio series numbers for the portfolios that address state business entities and transaction issues?
c. What are the title and number of the portfolio that addresses the federal constitutional limitations on state taxation?
d. Which portfolio discussed the Illinois sales and use tax on professional and personal services?