Hyper$-$Tech Enterprises manufactures mechanical parts used in air conditioning and heating units. The company employs over $300$ workers at its Alabama facility. None of the Hyper$-$Tech employees belongs to a union; however, management believes that unionization is in the near future. A representative of a local union has recently visited Hyper$-$Tech in an attempt to solicit members and have them sign authorization cards. Enough eligible employees have signed authorization cards to petition the NLRB for an election. Hyper$-$Tech's top executives are considering fighting the unionization efforts.

Which of the following, if true, supports the argument by the NLRB that Hyper$-$Tech has conducted unfair labor practices?

Hyper$-$Tech managers threatened and intimidated employees about their jobs, pay, and benefits, in the company cafeteria during lunch.

Hyper$-$Tech managers barred non$-$employee union representatives from entering the firm's building.

Hyper$-$Tech managers intervened when pro$-$union employees solicited other employees while both were on duty.

Hyper$-$Tech managers prohibited union representatives from soliciting employees who were on duty.