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

a