Describe the relationships between a context diagram, as in Figure (a), and the top-level diagram of a data flow diagram, as in Figure(b).

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D5 Receipts Matching Purchase Order Matching Stock Receipt Slips- - 1.0 Approve 、Invoice 2.0 Update Vendor Account Balance Vendor Invoice Approved Approved Invoice Invoice Old Account ン! Vendor D3 Account VendorI Halan D2l Payable Invoice Account Account Balances Check 4.0 Prepare Vendor New Checking Balance Check Register, G/L Summary I System Boundary Checking Balance Register Checking Account Accounting Invoices ACCOUNTING Payable Summaries ACCOUNTS PAYABLE Purthase Orders Vendor Information, Stock Receipts Checks PURCHASING Glected Invoice