Explanation:
The Internet Protocol (IP) stack is a layered architecture that is used to enable communication between two devices over the internet. It consists of five layers: Application layer, Transport layer, Network layer, Data Link layer, and Physical layer. Each layer has a specific function and communicates with the adjacent layers.

When data is sent from device A to device B, the data undergoes a process called encapsulation, where each layer adds its own header to the data. The headers contain information that is used by the receiving device to understand the data and how to handle it.

Layers of the Internet Protocol Stack:
1. Physical layer: This layer is responsible for the transmission of raw bits over a communication channel. It defines how data is transmitted over the physical medium, such as copper wire, fiber-optic cable, or wireless signals.

2. Data Link layer: This layer is responsible for the reliable transfer of data across a physical link. It provides error detection and correction, flow control, and framing of data.

3. Network layer: This layer is responsible for the routing of data across multiple network segments. It determines the best path for data to take from the sender to the receiver.

4. Transport layer: This layer is responsible for the reliable delivery of data between end systems. It provides services such as segmentation, flow control, and error recovery.

5. Application layer: This layer is responsible for providing services to end-users. It includes protocols such as HTTP, FTP, SMTP, and DNS.

Answer:
When data is sent from device A to device B, the 5th layer to receive data at B is the Application layer. This layer is responsible for providing services to end-users and includes protocols such as HTTP, FTP, SMTP, and DNS. The data is delivered to the Application layer after it has been processed by the lower layers of the stack. The header information added by each layer is removed in reverse order from the Application layer to the Physical layer. Once the data has been fully processed by the Application layer, it is ready for the user to view or interact with.