Answer the following questions on the vi editor and its usage. (UNIX)

a) The vi editor is described as a ______ editor.

b) The vi editor is similar to the ______ text editor.

c) The vi editor was originally named _____ by its creator Bill Joy

d) The vi editor supports using editing commands from the original UNIX text editor ____ (search for vi editor on the internet for the history of UNIX editors)

e) To scroll down one half of a screen while in the vi editor you enter the key sequence _______