Dealer's spread is most accurately defined by which of the following statements? a. Dealer's spread refers to the difference between the bid and asked prices of a security and represents the dealer's markup, or profit. b. Dealer's spread refers to the sum of the bid and asked prices of a security and represents the dealer's total revenue from the transacti c. Dealer's spread refers to the sum of the bid and asked prices of a security and represents the dealer's markup, or profit margin