Which one of the following principles best describes the basic operation of an electromagnet?
Options: Current is induced in a conductor that is moving through a magnetic field, Like magnetic poles repel, while unlike poles attract, Current flowing through a conductor generates a magnetic field, Like magnetic poles attract, while unlike poles repel
Options: A)for relatively permanent collections of data
b.for the size of the structure and the data in the structure are constantly changing
c.for both of above situation
d.for none of above situation
Which of the following is true concerning the mainframe?
Options: It is the same thing as client/server., Requires someone to decide which code should be on the workstation or the server., Mission-critical systems have tended to remain there., All of the above.