、IGP包括如下哪些协议（ A.
 RIP B.
 BGP C.
 IS-IS D.
 OSPF

单项选择题Directions: For each numbered blank in the following passage there are four choices labeled [A], [B], [C], and [D]. Choose the most suitable one. This may mean the difference between operating at_____ or at a loss.

多项选择题​在产品生命周期的哪个阶段，产品广告的目标是强化顾客对产品品牌的情感，提醒顾客关注该品牌，促进产品的习惯性需求（ ）‍