What should the developer do to resolve this issue?

A developer creates a custom component.

The component dialog includes the following two fields:

The component should display the first ‘X’ characters of the text entered in the ‘text’ input where ‘X’ is the number entered in the ‘charLimit’ input. If zero, or no value, is entered in the ‘charLimit’ input then the text should be unaltered. The developer creates the following Sling Model to perform the trancation:

A Null Pointer Exception occurs if NO charLimit values is set in the component dialog.

What should the developer do to resolve this issue?
A . Replace the defaultValue=”0” attribute of the ‘charLimit’ field in the dialog with min=”0”.
B . Add the @Default annotation to the ‘chatLimit’ variable in the Sling Model.
C . Replace the defaultValue=”0” attribute of the charLimit field in the dialog with defaultValue=”{Long}0”.
D . Change the defaultInjectionStrategy of the Truncation Sling Model to DefaultInjectionStrategy.REQUIRE

Answer: D