Comparing Agency Versus Dealer Markets,which Combination of the Following Statements

Comparing agency versus dealer markets,which combination of the following statements is true: (i) In a "dealer market," the broker takes the client's order through the agent,who matches it with another public order.
(ii) In an "agency market," the broker takes the trade through the dealer,who participates in trades as a principal by buying and selling the security for his own account.
(iii) In an "agency market," the broker takes the client's order through the agent,who matches it with another public order.
(iv) In a "dealer market," the broker takes the trade through the dealer,who participate in trades as a principal by buying and selling the security for his own account.
(v) An agent can be viewed as a "broker's broker."
(vi) A dealer can be viewed as a "broker's broker."

A) (i) ,(ii) ,and (v)
B) (i) ,(ii) ,and (vi)
C) (iii) ,(iv) ,and (v)
D) (iii) ,(iv) ,and (vi)