An organization has decided to use IP addresses in the range 172.20.128.0 to 172.20.143.255. Which combination of network ID and subnet mask identifies all IP addresses in this range?

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An organization has decided to use IP addresses in the range 172.20.128.0 to 172.20.143.255. Which combination of network ID and subnet mask identifies all IP addresses in this range?

Network ID: 172.20.128.0 Subnet mask: 255.255.255.0
Network ID: 172.20.128.0 Subnet mask: 255.255.0.0
Network ID: 172.20.128.0 Subnet mask: 255.255.224.0
Network ID: 172.20.128.0 Subnet mask: 255.255.240.0
Network ID: 172.20.128.0 Subnet mask: 255.255.255.240

Exam with this question: CCNA Exploration 1: ENetwork Final Exam