Mushrooms grow in dark corners without sunshine or fertilizer. They live and die by themselves. They will begin to be concerned by human beings only when they rise high enough, but at this time, they can accept the sunshine. People call this phenomenon mushroom effect.
According to the above definition, which of the following belongs to mushroom effect?
Xiao Liu is an MBA returned from studying abroad. As soon as he entered the company, he served as a department manager.