Identity which are correct and incorrect:

As large$-$scale corporations became more involved in mining operations in the West, many former prospectors became wage laborers for the companies. In turn, these miners formed unions to represent their interests. Identify the responsibilities of the unions.

A$.$ to negotiate with mining companies to address the issue of low wages

B$.$ to learn the grievances of workers and strike backdoor deals with management to ignore specific issues

C$.$ to defend miners in cases of on$-$the$-$job injury

D$.$ to recruit unskilled immigrants to replace workers who didn$$t cooperate