A user wants to use WAN access. Because the average business volume is very small, the average bandwidth is only 50Kbps, but the real-time requirements are very high. The user's budget is very limited, so the cost of use must be considered. The most suitable access method is ______.

The Ethernet port Ethernet0/0 of router MSR-1 is configured as follows:
interface Ethernet0/0
ip address 192.168.0.1 255.255.255.0
A three-layer switch is connected to this interface, and this three-layer switch is the default gateway of multiple network segments of the customer's office network. For security reasons, the customer now requires configuration on the interface Ethernet0/0 of MSR-1 ACL (does not restrict the application direction) to prohibit all users on the office network from pinging 192.168.0.1, which of the following configurations can be used? (multiple choice)