Acloud allows an organization to take advantage of the scalability and cost-effectiveness that a public cloud computing environment offers without exposing mission-critical applications and data to the outside world.
a) hybridb) privatec) pointd) community

a) hybrid cloud

Explanation:

Hybrid cloud -

It is mixes cloud computing methodology , which require a mixture of private cloud , on premises and the public cloud service and third party and thereby the balance between the two , is known as the Hybrid cloud .

This type of cloud enables more flexibility and the movement between the public and the private clouds .

Hence , from the statement of the question , the correct term from the given option is a) hybrid cloud .