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You are information security manager of HDA Inc. You want to determine what information a third party can extract from your web facing application. You use Netcat to port 443 and receive following information: HTTPs/1.1 200 OK Date: Sat, 17 Apr 2023 12:34:56 GMT Server: Apache/2.4.41 (Ubuntu) Last-Modified: Wed, 14 Apr 2023 15:46:23 GMT ETag: "1f8a-5a6361001387d" Accept-Ranges: bytes Content-Length: 8074 Vary: Accept-Encoding Content-Type: text/html Welcome to my website! ... ... Which of the following techniques is used by you to gather the information?