$1)$ What is the frame sent by the Link layer after adding the start characters

of a frame, end of a frame and transparency following the following characters:

DLE ETX DLE STX A STX DLE ETX DLE STX ETX DLE B DLE

$2)$ What is the frame sent by the Link layer after adding the start flags and

end, as well as the transparency bits following the following bits:

$011111111111111111111000001111101111011111111111$

$3)$ What is the sequence of bits obtained after removing the start and end delimiters of frames, as well as the transparency bits of the following bit sequence:

$0111111011111010111111001111110111100111110100010001111100101111110$