Answer : 4. "A) It is a legally binding contract outlining services delivered to an IT service provider that underpin a service that provider delivers to its customers. B) It is a written agreement between a supplier and the IT customer(s), defining the key service targets and responsibilities of both parties. C) It contains targets that underpin those within an SLA to ensure that targets will not be breached by failure of the supporting activity. D)"
Explanation :

Answer: D) It is an agreement between a supplier and another part of the same organization that assists with the provision of services. Explanation: An agreement between an IT service provider and another part of the same organization. An OLA supports the IT service provider's delivery of services to customers. The OLA defines the goods or services to be provided and the responsibilities of both parties.   * For an example there be an OLA - between the IT service provider and a acquiring department to obtain hardware in discussed times - between the Service Desk and a support group to provide Incident resolution in accepted times.