The correct answer is C. healthy planet, because Cisco recognizes environmental sustainability as a fundamental requirement for achieving its corporate Purpose of Powering an Inclusive Future for All.

Cisco's sustainability philosophy establishes that meaningful economic development, digital inclusion, community resilience, and technological advancement depend on maintaining a healthy and sustainable environment.

In a December 2022 Cisco Newsroom interview, Cisco's then-Chief Sustainability Officer, Mary de Wysocki, explicitly stated:

We just can’t have that future without a healthy planet.

newsroom.cisco.com

This statement connects Cisco's corporate Purpose directly to environmental stewardship and responsible resource management.

Cisco's environmental sustainability approach incorporates greenhouse gas emissions reduction, circular economy principles, energy efficiency, renewable energy adoption, and responsible product lifecycle management.

Although energy efficiency (Option A), business partnerships (Option B), and renewable electricity (Option D) are valuable components of sustainability initiatives, they represent individual strategies or enabling mechanisms rather than the overarching environmental dependency.

A healthy planet provides the ecological foundation for resilient communities, functioning economies, resource availability, and long-term social inclusion.

Consequently, Cisco integrates sustainability into its business strategy, product development, operations, and collaboration with customers and partners to align technological innovation with positive environmental outcomes.