Multicast is being deployed in the network， and only ip pim sparse-dense mode has been configured on all interfaces in the network to support a new video streaming application. No other multicast configuration was applied anywhere in the network. Since enabling multicast， the network monitoring tools show periodic spikes in link utilization throughout the network， even in areas where the video application is not being used. What could be a possible cause？（）
- APIM sparse mode is being used.
- BPIM dense mode is being used.
- CThe BGP multicast address family has not been configured.
- DIGMP version 3 is being used.
- EIP PIM neighbor filters have not been applied.