Final answer:
Observation of the client's physical inventory count procedures is not a substantive auditing procedure related to the rights and obligations assertion but instead is related to the existence and completeness of inventory.
Step-by-step explanation:
In auditing the inventory balance of a client, auditors must assess whether the client has the rights and obligations over their reported inventory. The substantive auditing procedures for verifying these assertions include:
- Confirmation of inventory held by third parties to ensure that the client has rights to the inventory.
- Inspection of purchase invoices and receiving reports to confirm the client's obligations and ownership over the recorded inventory.
- Examination of title documents for owned inventory to provide evidence of the client's rights over the inventory.
However, D) Observation of the client's physical inventory count procedures is not a direct substantive procedure related to the rights and obligations assertion but rather pertains to the existence and completeness of inventory.