______ and ______ are two aspects of one mode of trade by which the inviter sends out an announcement of tender in order to call bidders to bid within the time limit.
【单选题】a. 连环撞 b. 实时路况 c. 占用紧急车道① not fasten seat belt while driving ② a chain collision ③ to write a ticket ④ to drive under the influence ⑤ to occupy emergency lane ⑥ live traffic