The correct answer is A .

TOGAF 9.2 defines Architecture Contracts as joint agreements between development partners and sponsors on the deliverables, quality, and fitness-for-purpose of an architecture. They are used to formalize the obligations, expectations, and governance arrangements needed to ensure that architecture work and implementation activity remain aligned with the agreed architecture.

Option A is correct because Architecture Contracts are explicitly used to formalize agreement between development partners and sponsors.

Option B is incorrect because a Service Level Agreement usually defines expected service levels between a service provider and consumer. It is not the TOGAF mechanism for formalizing architecture deliverables, quality, and fitness-for-purpose.

Option C is incorrect because a Non-disclosure Agreement is a legal confidentiality agreement. It does not define architecture deliverables or architecture fitness-for-purpose.

Option D is incorrect because the Statement of Architecture Work defines the scope and approach for an architecture engagement. It authorizes and frames the architecture work, but it is not the TOGAF deliverable specifically defined as the joint agreement between development partners and sponsors.