Companies in the United States. The company recently provided information

companies in the United States. The company recently provided information about its major business segments as follows (in millions):

A.  How does a brokerage company like Schwab define the Investor Services and Advisor Services segments? Use the Internet to develop your answer.
B.  Provide a specific example of a variable and fixed cost in the Investor Services segment.
C.  Estimate the contribution margin for each segment, assuming depreciation represents the majority of fixed costs.
D.  If Schwab decided to sell its Advisor Services accounts to another company, estimate how much operating income would decline