The National Labor Relations Board's Composition Changes Based On

The National Labor Relations Board's composition changes based on:

A) whether the current President of the United States is "pro-labor" or "pro-management"
B) whether the current President of the United States is in his first or second term
C) whether Democrats or Republicans have a majority in the Senate
D) whether Democrats or Republicans have a majority in the House of Representatives
E) the NLRB's composition does not change because there must always be a balance of "pro-labor" and "pro-management" members