Which of the following protocol is/are defined in Transport layer? Select one: a. TCP b. TCP and UDP O c. UDP d. FTP e. DNS Each DLL Frame must contain Source and Destination MAC addresses Select one: O True O False The CRC Code used for error check Select one: O True O False The sources of light for Multi mode optical fiber communication that provides an unfocused light which hits the core boundaries. Select one: a. OLD b. Lazer C. LED d. ILD