【单选题】
Refer to the exhibit. Switch S2 contains the default configuration. Switches S1 and S3 both have had the command spanning-tree mode rapid-pvst issued on them. <br /> What will be the result？（）<br /> <img src="https://nimg.ppkao.com/2018-07/gelingxia/201807310941447112.jpg?sign=1925585be5f3a30a67908865773f31b3&t=62d45a78" />
A、Switches S1 and S3 will be able to exchange traffic but neither will be able to exchange traffic with Switch S2
B、Switches S1， S2， and S3 will be able to pass traffic between themselves. However， if there is a topology change， Switch S2 will not receive notification of the change.
C、Switches S1， S2， and S3 will be able to pass traffic between themselves.
D、IEEE 802.1D and IEEE 802.1w are incompatible. All three switches must use the same standard or no traffic will pass between any of the switches.
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