Which command do you enter so that a switch configured with Rapid PVST + listens and learns for a specific time period?
switch(config)#spanning-tree vlan 1 max-age 6
switch(config)#spanning-tree vlan 1 hello-time 10
switch(config)#spanning-tree vlan 1 priority 4096
switch(config)#spanning-tree vlan 1 forward-time 20
Forward time : Determines how long each of the listening and learning states last before the port begins forwarding.
Switch(config)# [ no ] spanning-tree vlan vlan_ID forward-time forward_time
Configures the forward time of a VLAN. The forward_time value can be from 4 to 30 seconds.
https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst4500/12-2/15-02SG/configuration/guide/config/spantree.html#56177
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