Consider the following code fragment, which sets up the retrieval of an XML document named fish.xml and calls a function named showFish(): var xmlhttp = new XMLHttpRequest(); xmlhttp.open("GET", "fish.xml", true); xmlhttp.onreadystatechange = showFish(); xmlhttp.send(); Which line of code initializes the XMLHttpRequest object?

A. xmlhttp.send();

B. var xmlhttp = new XMLHttpRequest();

C. xmlhttp.open("GET", "fish.xml", true);

D. xmlhttp.onreadystatechange = showFish();

Which of the following is a valid variable name in JavaScript?

A. this

B. that

C. 2that

D. 2this

When used in conjunction with SQL, a server-side language (such as PHP) and a database (such as mySQL), AJAX can perform which of the following database operations?

A. Update the database schema and table relationships

B. Create custom database views and stored procedures

C. Modify database security permissions, including changing the database owner

D. Retrieve information from a database and display it back to the page originating the request

Consider the following code:

What needs to be changed to allow this script to run without error?

A. Change the substring method call to substr

B. Change the substring method call to substr()

C. Change the characterAt method call to charAt

D. Change the characterAt method call to characterat

Consider the following code:

What is the expected output when you run this script in a browser?

A. A button labeled Click Me will appear, with an input box that displays the following default text: Old Value. Upon clicking the button, the textin the text box will change to New Value. Upon clicking the button again, the text in the text box will change back to Old Value.

B. A button labeled Click Me will appear, with an input box that displays the following default text: Old Value. Upon clicking the button, the text inthe text box will change to New Value. Upon clicking the button again, the text in the text box will change to Old Value, New Value.

C. A button labeled Click Me will appear, with an input box that displays the following default text: Old Value. Upon clicking the button, the text inthe text box will change to New Value. Upon clicking the button again, you will see nothing change.

D. This script will not run. You will get an error because the value="Old Value" statement in the tag contains the reserved wordValue within the quotes.