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单项选择题 Click the Exhibit button. As a maintenance feature， you have created this servlet to allow you to upload and remove files on yourweb server. Unfortunately， while testing this servlet， you try to upload a file using an HTTP request and onthis servlet， the web container returns a 404 status. What is wrong with this servlet？（）

A、HTTP does NOT support file upload operations.

B、The servlet constructor must NOT have any parameters.

C、The servlet needs a service method to dispatch the requests to the helper methods.

D、The doPut and doDelete methods do NOT map to the proper HTTP methods.

  • B

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