You have an outage in your compute engine managed instance group: all instance keep restarting after 5 seconds. you have a health check configured, but autoscaling is disabled. your colleague, who is a linux expert, offered to look into the issue. you need to make sure that he can access the vms. what should you do?
a. grant your colleague the iam role of project viewerb. disable the health check for the instance group. add his ssh key to the project-wide ssh keysc. perform a rolling restart on the instance groupd. disable autoscaling for the instance group. add his ssh key to the project-wide ssh keys