A data center administrator is upgrading an ACI fabric. There are 3 APIC controllers in the fabric and all the servers are dual-homed to pairs of leaf switches configured in VPC mode. How should the fabric be upgraded to minimize possible traffic impact during the upgrade?
A. 1. Create two maintenance groups for the APIC controllers: VPC left and VPC right.
2. Upgrade the first group of controllers.
3. Upgrade the second group of controllers.
4. Upgrade the leaf switches.
B. 1. Create two maintenance groups for APIC controllers: VPC left and VPC right.
2. Upgrade the leaf switches.
3. Upgrade the first group of controllers.
4. Upgrade the second group of controllers.
C. 1. Create two maintenance groups for the leaf switches: VPC left and VPC right.
2. Upgrade the APIC controllers.
3. Upgrade the first group of leaf switches.
4. Upgrade the second group of leaf switches.
D. 1. Create two maintenance groups for the leaf switches: VPC left and VPC right.
2. Upgrade the first group of switches.
3. Upgrade the second group of switches.
4. Upgrade the APIC controllers.
is that C will be better?