Question $1$

Which of the following about network coding is$/$are true?

Network coding can improve the performance in data broadcasting

Network coding$/$decoding scheme has to be agreed upon beforehand.

For linear network coding, the output flow at a given node is obtained as a linear combination of its input flows. The coefficients of the combination are, by definition, selected from an infinite field

For linear network coding, the content of any information flowing out of a set of non source nodes cannot be derived from the accumulated information that has flown into the set of nodes