A medium-sized highway construction company CST has chosen to constrain its investment in computing resources to laptop and desktop computers and the necessary networking hardware and software to access the Internet efficiently. All of CST's data is to be stored off-site through an Internet-enabled storage provider that is used by many different companies and organizations.

If CST uses an accounting software package hosted at a providers site, and the data shared between the storage providers cloud and the accounting software providers cloud then the overall service model being employed by CST is:

a) public

b) private

c) community

d) hybrid

if possible can you explain the answer ?