What subnet mask would a network administrator assign to a network address of 172.30.1.0 if it were possible to have up to 254 hosts?

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What subnet mask would a network administrator assign to a network address of 172.30.1.0 if it were possible to have up to 254 hosts?

255.255.0.0
255.255.255.0
255.255.254.0
255.255.248.0

Exam with this question: Network Fundamentals - CCNA Exploration 1: ENetwork Chapter 6 Exam