Which component of the Cisco SDN solution serves as the centralized management system?

Question:
Which component of the Cisco SDN solution serves as the centralized management system?

• Cisco OpenDaylight
• Cisco ACI
• Cisco APIC
• Cisco IWAN

Explanation: http://www.cisco.com/c/en/us/solutions/data-center-virtualization/application-centric-infrastructure/index.html
Cisco Application Policy Infrastructure Controller (APIC)
Provides single-click access to all Cisco ACI fabric information, enabling network automation, programmability, and centralized management.

http://www.cisco.com/c/en/us/products/cloud-systems-management/application-policy-infrastructure-controller-apic/index.html
The Cisco Application Policy Infrastructure Controller (Cisco APIC) is the unifying point of automation and management for the Application Centric Infrastructure (ACI) fabric. The Cisco APIC provides centralized access to all fabric information, optimizes the application lifecycle for scale and performance, and supports flexible application provisioning across physical and virtual resources.

The Cisco APIC provides centralized access to all fabric information, optimizes the application lifecycle for scale and performance, and supports flexible application provisioning across physical and virtual resources.

Centralized application-level policy engine for physical, virtual, and cloud infrastructures
Designed for automation, programmability, and centralized management, the Cisco APIC itself exposes northbound APIs through XML and JSON. It provides both a command-line interface (CLI) and GUI which utilize the APIs to manage the fabric holistically.
Cisco APIC provides:
A single pane of glass for application-centric network policies
Fabric image management and inventory
Application, tenant, and topology monitoring
Troubleshooting

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