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单项选择题 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 licensepackage. When a client pays for a specific service， you provide them with a license extension key that theyinsert into the  of the deployment descriptor. Not every client will have this contextparameter so you need to create a context listener to set up a default value in the licenseExtensionparameter. Which code snippet will accomplish this goal？（）

A、

B、

C、

D、

  • A

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