Which configuration correctly assigns the deny-telnet firewall filter as an input filter to all ports in VLAN 200?

The selected configuration accurately assigns the deny-telnet firewall filter as an input filter to all ports in VLAN 200 by using the correct syntax and structure for specifying filters within the VLAN configuration.

In this configuration, "filter { input deny-telnet; }" is nested directly under the VLAN statement. This structure clearly indicates that the specified filter applies to the input of all interfaces that are members of VLAN 200. By organizing the configuration in this manner, it is clear that the input filter is intended to affect the entire VLAN, rather than being limited to a specific interface or incorrectly structured.

The hierarchical structure is important in Junos OS syntax, where the placement of configuration statements determines their scope and validity. Here, placing the filter under the VLAN declaration indicates that it will be applied to all relevant interfaces, which is crucial for the intended effect of restricting Telnet access within the VLAN.

In summary, this option effectively implements the required access control by associating the filter with the VLAN context, ensuring that all ports within VLAN 200 adhere to the defined security policy.