Ms$.$ Lauren McFerran currently serves as chairperson of the National Labor Relations Board $($NLRB$).$ Which of the following is incorrect regarding the role of the NLRB$?$

It is responsible for certifying union election results.

It is responsible for conducting a union election if one is warranted.

It is responsible for overseeing union organizing campaigns.

It is responsible for endorsing unionization in industries that have been historically nonunionized.