Your network has four hyper-v hosts, which are running three domain controllers and about 10 member servers. three of the member servers named hr1, hr2, and hr3 are running on a windows server 2012 r2 hyper-v host; the others are running on windows server 2016 hyper-v hosts. all vms are running windows server 2016. you are currently running an enterprise human resources application on the hr1, hr2, and hr3 servers. you are considering upgrading this application to a new version that was recently released. before you proceed with the upgrade, you set up a test environment consisting of a windows server 2016 hyper-v host and three vms. you haven't been using checkpoints on any of your vms, but you want to start doing so as an extra form of disaster recovery in the event of vm corruption or errors introduced by updates. on your test environment, you want to use checkpoints while you are testing the new application. what type of checkpoints should you use throughout your live network and test network? explain your answer.

a  social news website  is an  internet  website  that features  user-posted stories. such stories are ranked based on popularity, as voted on by other users of the site or by website administrators. users typically comment online on the news posts and these comments may also be ranked in popularity. since their emergence with the birth of  web 2.0, social news sites have been used to link many types of information, including news, humor, support, and discussion. all such websites allow the users to submit content and each site differs in how the content is moderated. on the  slashdot  and  fark  websites,  administrators  decide which articles are selected for the front page. on  reddit  and  digg, the articles that get the most votes from the community of users will make it to the front page. many social news websites also feature an online comment system, where users discuss the issues raised in an article. some of these sites have also applied their voting system to the comments, so that the most popular comments are displayed first. some social news websites also have a  social networking  function, in that users can set up a user profile and follow other users' online activity on the website.