D becaus ig is following INSTRUCTIONS
Answer:
Physical Layer is responsible for the communication of the unstructured raw data streams over a physical medium.
Explanation: Physical Layer maintains the date rate (how many bits a sender can send per second). It performs Synchronization of bits. It helps in Transmission Medium decision (direction of data transfer).
Answer:
True.
Explanation:
It is true that some applications work on some devices but not on others. This is so because it depends on the operating system of each device, that is, if the device has an operating system compatible with the application in question, said application will work, but if, on the contrary, the operating system is not compatible, the application will not be useful in this.