Which code snippet will accomplish this goal?

You have built a web application that you license to small businesses. The webapp uses a context parameter, called licenseExtension, which enables certain advanced features based on your client’s license package. When a client pays for a specific service, you provide them with a license extension key that they insert into the <context-param> of the deployment descriptor. Not every client will have this context parameter so you need to create a context listener to set up a default value in the licenseExtension parameter.
Which code snippet will accomplish this goal?
A. You cannot do this because context parameters CANNOT be altered programmatically.
B. String ext = context.getParameter(‘licenseExtension’);
if ( ext == null ) {
context.setParameter(‘licenseExtension’ DEFAULT);
}
C. String ext = context.getAttribute(‘licenseExtension’);
if ( ext == null ) {
context.setAttribute(‘licenseExtension’ DEFAULT);
}
D. String ext = context.getInitParameter(‘licenseExtension’)
if ( ext == null ) {
context.resetInitParameter(‘licenseExtension’ DEFAULT);
}
E. String ext = context.getInitParameter(‘licenseExtension’)
if ( ext == null ) {
context.setInitParameter(‘licenseExtension’ DEFAULT);
}

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