How does the text define$$ "the cloud"?

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Part $1$

A$.$

The static leasing of dedicated computer resources over the Internet.

B$.$

The dynamic purchase of computer resources from an$$ unknown, low$-$cost supplier.

C$.$

The elastic leasing of dedicated computer resources.

D$.$

The static leasing of pooled computer resources over the Internet.

E$.$

The elastic leasing of pooled computer resources over the Internet.