E$-$Corp offers a cloud service that includes a hosted infrastructure, operating system, and services. Customers paying for this cloud service can install and operate their own applications and store data on E$-$Corp's cloud infrastructure. Which of the following cloud$-$based offerings is E$-$Corp providing to their customers?

platform as a service $($PaaS$)$

infrastructure as a service $($laaS$)$

database as a service $($DaaS$)$

software as a service $($SaaS$)$