"Hosted on a private infrastructure and comprising servers, storage disks and networking equipment" - This statement best describes?

"Hosted on a third-party data centre where companies merely lease the entire IT infrastructure on a subscription, pay-as-you-go basis." - This statement best describes?

"Companies can lease hardware infrastructure and sign up for software services such as Google Apps or Microsoft Office 365" - This statement best describes?

"Can be hosted either at a third-party data centre or a privately owned premises where equipment is leased or owned and operated by a private entity." - This statement best describes?

"Some application and data are stored privately – for example, core banking apps such as savings and credit cards – while other applications can reside in the public cloud such as HR and procurement." - This statement best describes?

Which of the following workplace solution(s) is hosted on public cloud