Which of the following BEST describes an operational level agreement (OLA)?

While OLA targets do help protect SLA targets, this description omits the defining characteristic that an OLA is an internal agreement between parts of the same organization.

An OLA is defined in ITIL as an agreement between an IT service provider and another internal part of the same organization, such as a network team or facilities group. It specifies internal roles, responsibilities, and targets that collectively underpin the commitments made to customers in an SLA. Unlike an SLA or underpinning contract, it is an internal, non-legally-binding arrangement.

This describes a Service Level Agreement (SLA), which is a formal agreement between an IT service provider and its customer defining key service targets and responsibilities.

This describes an Underpinning Contract (UC), which is a legally binding agreement with an external third-party supplier whose services underpin IT service delivery.