Final answer:
B. Deencapsulation, which is the process of removing header information as a Protocol Data Unit (PDU) is passed upwards through the OSI model's layers.
Step-by-step explanation:
The correct answer is option B. Deencapsulation. In the context of network communications, deencapsulation refers to the process by which a Protocol Data Unit (PDU) is passed up from a lower layer to a higher layer in the OSI model, and during this process, the header information added by the lower layer is removed.
At each successive layer, as data is passed upward, headers (and sometimes trailers) that were added by the corresponding lower layer are stripped away, effectively 'peeling off' layers of encapsulation that were previously added to ensure proper transmission and routing through the network.
This is the reverse of encapsulation, where data is passed down the layers with headers and footers added at each layer. Deencapsulation ultimately allows the receiving system to process the original application data after having been sent across the network. Understanding the entire process of encapsulation and deencapsulation is fundamental in networking.