The objects that you place on master pages are called ____.

Suppose s is a string with the value "java". What will be assigned to x if you execute the following code?

``` char x = s.charAt(4); ``` a. 'a' b. 'v' c. Nothing will be assigned to x, because the execution causes the runtime error StringIndexOutofBoundsException.

Consider a relation R(A,B,C,D,E) with the following dependencies:

``` AB -> C CD -> E DE -> B ``` Is AB a candidate key of this relation? If not, is ABD? Explain your answer.