As shown in the figure, two IPv6 networks need to access the IPv4 network. An IPsec tunnel needs to be established between the two IPv6 networks to enable communication. Which of the following encapsulation modes can meet the preceding requirements? 
Definitions:
Cost of Goods Sold
Direct expenditures associated with the process of producing goods for sale by a company, which include materials and labor.
Average Inventory
The mean value of inventory over a certain period of time, calculated to assess inventory levels and turnover.
Accounts Receivable Turnover
A financial ratio that measures how efficiently a company collects revenue from its customers by comparing net credit sales to average accounts receivable.
Net Credit Sales
The total revenue from sales made on credit, minus returns and allowances, over a specific period.
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