Which of the following is an example of green computing?

A) Purchase and use products with an ENERGY STAR label.
B) Keep devices turned on and ready to use, even at night.
C) Request printed receipts.
D) Purchase new models of devices as soon as they are released.

Purchasing and using products with an ENERGY STAR label is an example of green computing as this indicates that the product has been designed to be energy efficient and reduce its environmental impact. Option B, keeping devices turned on and ready to use even at night, is not an example of green computing as this wastes energy. Option C, requesting printed receipts, is also not an example of green computing as it promotes paper usage which can lead to deforestation. Option D, purchasing new models of devices as soon as they are released, is not necessarily an example of green computing as it encourages consumption and disposal of electronic devices, which can lead to e-waste pollution if not disposed of properly.