Which of the following is not a cloud implementation type? Public cloud: This type of cloud infrastructure is built by a third$-$party organization to sell cloud services to the general public. b$.$ Private cloud: This type of internal cloud is built by an organization for the sole purpose of servicing its own needs Community cloud : This type of cloud is built by and for a specific group of organizations that share a common trade $.$ d $.$ Shared Cloud: This type of cloud is built by a group of organizations for the purpose of sharing it with the public.