Which of the following is a criterion used by the NLRB to determine that an appropriate bargaining unit exists?

$(2$pts$)$

Question $10-$ Which of the following is a criterion used by the NLRB to determine that an appropriate bargaining unit exists?

the percentage of employees who have signed authorization cards

whether employees are paid at the same rate and$/$or under a reasonable and logical pay scale

whether professional employees would be mixed with non$-$professional employees against their will

all of the above

none of the above