By default, elements in a Web page are positioned as ________ in the window, unless defined differently

To change a roaming profile to a mandatory profile, you need to rename the _________ file

a. NTuser.dat b. NTuser.man c. Prof.dat d. Prof.man

____________________ techniques are used when it is too expensive or dangerous to experiment with real systems.

Fill in the blank(s) with the appropriate word(s).