Câu 4: ECSAV10: EC-Council Certified Security Analyst

An employee is trying to access the internal website of his company. When he opened a webpage, he received an error message notifying `Proxy AuthenticationRequired.` He approached the IT department in the company and reported the issue. The IT staff explained him that this is an HTTP error indicating that the server is unable to process the request due to lack of appropriate client's authentication credentials for a proxy server that is processing the requests between the clients and the server. Identify the HTTP error code corresponding to the above error message received by the employee?

1. A. 415
2. B. 417
3. C. 407 — đáp án hiện tại
4. D. 404