Which type of a password cracking attack uses a predefined dictionary and prepends or appends characters to the dictionary word in an attempt to discover the password?

______ virtualization systems are typically seen in servers, with the goal of improving the execution efficiency of the hardware.

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

Which of the following is true about query design?

A. the LIKE operator enhances performance B. it's best to use relative names when referring to database objects C. sorting should be done by the SQL server, not the client application D. subqueries can degrade performance