问题：

[单选]

Refer to the exhibit. Available public Internet sites are sometimes used for estimating performance. Which statement regarding their use for estimating VPN performance is correct?（）

A . Throughput results are valid as a value from the Teleworker's home to the corporate site, regardless of the location of the public test server. 
B . Throughput results may not be valid due to the public server's location on the Internet and fluctuations based on the use of the public server. 
C . Throughput values are not affected by the choice of split tunneling or Internet access through the VPN. 
D . Throughput results are unrelated to the Teleworker PC configuration or current PC use.