Here is a good practice question that is very similar to something I saw last time I took the Series 65:
Jessica Stevens works for a federal covered adviser with an office in State A. Only once per month Jessica meets with a few clients at a diner in State B. Therefore:
A. Jessica is exempt from registration requirements in State B because she works for a federal covered adviser
B. Jessica must register in State B because she has a place of business there
C. Jessica must register in State B because she has clients in that state
D. Because the diner is not an actual office, Jessica need not register in State B
EXPLANATION: there is no such thing as "an actual office," so eliminate Choice D. An IAR has to register in any state where she has a place of business, so Choice A is eliminated. Choice C is tempting, but we don't know if the clients are residents of State B or if they just find it easier to meet Jessica there. Yes, anyplace where you conduct business is a "place of business." In fact, if you just let it be known that you can meet clients at a diner in State B, you have a place of business there.