When one DNS server receives a recursive request, that DNS server issues which of the following to the name servers in its hierarchy, or to servers provided as pointers in reply to earlier requests, until an answer is received?

When deleting a node from a binary search tree that has two children, the reason we can replace its element with the greatest value in its left subtree is because:

A. the value will become greater or equal to the values of its children B. the value will be greater than everything on its left, and since it was in the left subtree, it will be less than everything in the right subtree C. Both A and B D. Neither A nor B

Case 10-2 Melissa helps you figure out how to use the OleDbDataAdapter to make a connection to a database for you. But in order to help you learn as much as you can, she wants you to begin to figure out things on your own. Which of the following is NOT a true statement Melissa can make to you about filling the DataTable object you have created?

A. As soon as you connect to the database and fill the DataTable object, the next statement should disconnect the application from the database. B. To keep the maximum number of connections available, you should keep connections open only as long as necessary. C. After the DataTable is initialized, it must be filled using the Populate command with the data from the selected table. D. By using the database in disconnected form, the system resources of the computer and network are not overloaded.