Harry howard, a successful real estate broker, has established his own real estate company in western pennsylvania. he has on-the-job experience working at a real estate company where he had a whole staff supporting brokers' work. now on his own, with two secretaries, harry is building his dream of owning and growing his own business. he wants to mainly focus on middle-to-upper-income homeowners and is exploring what type of promotional material he needs to have. which of the following would be the fastest way for harry to build his client base? a. word-of-mouthb. full-scale advertisingc. personal sellingd. sales promotio