You need to recommend a solution that addresses the concurrency requirement. What should you recommend?

Using a DTC transaction adds distributed transaction overhead and still does not prevent deadlocks if the underlying table access order remains inconsistent across procedures.

When multiple stored procedures acquire locks on the same tables but in different orders, they can create circular wait chains that result in deadlocks. By standardizing the table update order across all stored procedures, you ensure that locks are always requested in the same sequence, preventing circular dependencies and resolving the concurrency/deadlock issue without requiring distributed transactions or architectural changes.

Making calls to Sales.Proc1 and Sales.Proc2 synchronously serializes application-level execution but does not address deadlocks that occur within the database engine due to inconsistent lock ordering across concurrent sessions.

Breaking each stored procedure into two separate procedures does not inherently resolve deadlocks unless the resulting procedures also update tables in a consistent order, making this an incomplete and unnecessarily complex solution.