Phobos, a cloud vendor, leases a cloud service that includes a fully$-$managed infrastructure, virtualization, operating system, and other software. Customers leasing this service can then install and operate their own applications and store data on E$-$Corp's cloud. Which of the following cloud$-$based offerings is Phobos providing to their customers?

Group of answer choices

Software as a Service $($SaaS$)$

Platform as a Service $($PaaS$)$

Infrastructure as a Service $($IaaS$)$

Data as a Service $($DaaS$)$