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.  What will be the result？（）

• A、 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.
• B、 Switches S1， S2， and S3 will be able to pass traffic between themselves.
• C、 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.
• D、 Switches S1 and S3 will be able to exchange traffic but neither will be able to exchange traffic  with Switch S2