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You are troubleshooting a VoIP system for a small office. Employees are reporting issues such as call dropouts, echo, and glitches during calls. Upon investigation, you notice that the network is experiencing congestion due to multiple users downloading large files simultaneously. What is the BEST solution to improve VoIP call quality in this scenario? (.) Replace the VoIP phones with newer models that support higher data rates. (_) Increase the Internet bandwidth by upgrading the office's ISP plan. Configure Quality of Service (QoS) on the router to prioritize VoIP traffic. Advise employees to schedule large downloads during non-working hours