Which statement is true about industry standards for cellular networks?

Question:
Which statement is true about industry standards for cellular networks?

• First generation cellular standards are mostly digital standards.
• Third generation cellular standards require a maximum of 1 Gb/s for devices moving slowly, such as when a user has a mobile device and is walking.
• Cellular standards have made it more difficult and expensive to make calls to people that are on a different network.
• Cell phones that use a single standard can often only be used in specific geographic areas.

Exam with this question: IT Essentials (ITE v7) Chapter 8 Exam Answers