What command do you use to download 8: install packages from the internet? 1. library() 2. install.packages() 3. install packages() 4. There is no command. You must visit cran.r-proiect.org and download packages manually How often do you need to install a package on your computer? 1. Every time you restart R 2. Every time you restart your computer 3. Only once. Afterwards, R can find it on your hard drive as needed. 4. Never, as long as you are connected to the internet. How often do you need to use the library command to open each package you need? 1. Every time you restart R 2. Every time you restart your computer 3. Only once. Afterwards, R can find it on your hard drive as needed. 4. Never, as long as you are connected to the internet