Explanation

In the ISO/OSI reference model, the Data Link Layer (Layer 2) is divided into two sublayers:

1. Logical Link Control (LLC) Sublayer - Responsible for flow control, error control, and framing
2. Media Access Control (MAC) Sublayer - Responsible for controlling access to the physical medium

Why other options are incorrect:

• A: Flow control and congestion control are functions of the Data Link Layer, but they are not the sublayers themselves
• C: Multiplexing is a function of various layers, but not a sublayer of Data Link Layer
• D: Physical and Network are separate layers (Layer 1 and Layer 3), not sublayers of Data Link Layer
• E: Transport and Presentation are separate layers (Layer 4 and Layer 6), not related to Data Link Layer sublayers

The correct answer is B because it accurately identifies the two standard sublayers of the Data Link Layer in the OSI model: Logical Link Control (LLC) and Media Access Control (MAC).