Which three practices are commonly adopted... environment?

Which three practices are commonly adopted when setting up a penetration testing lab environment? (Choose three.)

use a honeypot for all tests run from the physical attack platforms
create the penetration testing environment using virtual machines and virtual switches
create the penetration testing environment using physical equipment and switches in order to route the packets freely
ensure that when something crashes, it can be determined how and why it happened
use an open environment to allow for free passage of attack packets to the target machines
use a closed environment for all testing purposes

Explanation & Hints:

The following is a list of requirements for a typical penetration testing environment:

Closed network: Ensure controlled access to and from the lab environment and restricted access to the Internet.
Virtualized computing environment: This allows for easy deployment and recovery of devices being tested.
Realistic environment: Using a staging testing environment should match the real environment as closely as possible.
Health monitoring: When something crashes, ensure the ability to determine how and why it happened.
Sufficient hardware resources: Ensure that a lack of resources does not cause false results.
Multiple operating systems: Test or validate a finding from another system. Testing from different operating systems is always good to see if the results differ.
Duplicate tools: A great way to validate a finding is to run the same test with a different tool to see if the results are the same.
Practice targets: Practice the penetration tools constantly. To do this, practice on targets that are known to be vulnerable.