Which of the following statements best describes Cisco's environmental vision goals?

a. To reduce greenhouse gas (GHG) emissions from our worldwide operations by 60 percent by 2022.
b. Cisco is aiming to use electricity generated from renewable sources for at least 85% of the company's global electricity needs by 2022.
c. Improve product power consumption from plug to port, with a goal to achieve a six to seven percent increase in system energy efficiency to a target of 92 percent by 2020.
d. All of the above.