Which type of connection should a straight-through cable be used for?

Which type of connection should a straight-through cable be used for?

• Switch to router
• Switch to hub
• Switch to switch
• Hub to hub 

EXPLANATION

To specify when we use crossover cable or straight-through cable, we should remember:
Group 1: Router, Host, Server
Group 2: Hub, Switch
One device in group 1 + One device in group 2: use straight-through cable
Two devices in the same group: use crossover cable
In this case we can use straight-through cable to connect a switch to a router -> is correct.