Multiple users are experiencing slow performance when downloading large files from a specific site. Which of the following should the technician do to check the connection to the external site?

A、 Check the latency by running a continuous ping to the site.
B、 Perform the ipconfig/flushdns command on the affected users’PCs.
C、 Run a speedtest from a user’s PC to a site on the Internet.
D、 Verify if there is MTU mismatch in the path to the site.