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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.

單項(xiàng)選擇題

Given：
10.public void service（ServletRequest request，
11.ServletResponse response） {
12.ServletInputStream sis =
13.// insert code here
14.}
Which retrieves the binary input stream on line 13？（）

A.request.getWriter（）；
B.request.getReader（）；
C.request.getInputStream（）；
D.request.getResourceAsStream（）；

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Given： 10.public void service（ServletRequest request， 11.ServletResponse response） { 12.ServletInputStream sis = 13.// insert code here 14.} Which retrieves the binary input stream on line 13？（）

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Given：
10.public void service（ServletRequest request，
11.ServletResponse response） {
12.ServletInputStream sis =
13.// insert code here
14.}
Which retrieves the binary input stream on line 13？（）