Specifications include, but are not limited to: King County’s preferred scenario is to have a single Contractor who can best provide all the features, capabilities and functionality identified in Attachment D - Solution Requirements. If the Proposer cannot directly provide all functionality required, the Contractor may consider integration of third-party products provided by Subcontractors to provide the required functionality. However, the Contractor shall have the responsibility of the Solution as a whole and if necessary, will function as a system integrator responsible for and accountable to the full delivery and continued functionality of the products and services. All subcontracted or supplied functionality needs to be clearly disclosed in the Proposal.