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Cisco Certified Network Associate (CCNA) · Cisco
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from jump you can see that it's missing the sub int for vlan 3...then it's process of elimination. look at the cidr in the image then peep the subnet masks listed in the answer choices. no need to overthink it.
You need to create another subinterface for VLAN 3 with its corresponding default gateway.
It is option B. interface GigabitEthernet0/0.10 encapsulation dot1Q 3 ip address 10.10.2.10 255.255.254.0 Let me break it down... --> The gig0/0.10 is a sub interface and need not match with the VLAN ID, it could be any arbitrary number. --> encapsulation dot1Q vlan 3 specifies configuration for vlan 3 --> subnet mask has already been given --> 255.255.254.0 --> config for VLAN 2 has already been configured and the option we are choosing is for VLAN 3 now, both VLAN 2 and 3 has been configured on the router to facilitate communication So, it is Option B