Which of the following will not occur at the Physical Layer?

At the Physical Layer, the primary focus is on the actual transmission and reception of raw data over a physical medium. This layer deals with the electrical, optical, or radio signals that represent bits.

Bit transmission is fundamental to the Physical Layer as it involves sending individual bits across the communication medium, ensuring they are correctly transmitted as electrical or optical signals. Signal modulation is also a critical function at this layer, as it involves changing the form of the signal to prepare it for transmission. Data encoding is necessary at this layer to convert data into a format suitable for transmission, making it essential for accurately sending bits over a medium.

Rerouting of information is a function typically associated with higher layers of the OSI model, such as the Network Layer, which is responsible for determining the best path through the network for data to take. This process relies on logical addressing and routing protocols, which are outside the scope of the Physical Layer's responsibilities. Therefore, this task would not occur at the Physical Layer, distinguishing it from the other functions that indeed take place there.