A company has several networks with the following IP address requirements: What does VLSM allow a network administrator to do?

Question:
A company has several networks with the following IP address requirements:

IP phones – 50
PCs – 70
IP cameras – 10
wireless access points – 10
network printers – 10
network scanners – 2

What does VLSM allow a network administrator to do?

• utilize one public IP address to translate multiple private addresses
• utilize multiple different subnet masks in the same IP address space
• utilize one dynamic routing protocol throughout the entire network
• utilize multiple routing protocols within an autonomous system
• utilize one subnet mask throughout a hierarchical network

Exam with this question: CCNA 2 (v5.0.3 + v6.0) Chapter 6 Exam Answers