Please give clear explanation with steps for all parts of tye questions( Also include diagrams wherever necessary)

Answer each question, giving a short explanation or an example or multiple examples as appropriate. (You are expected to know what counts as proper justification.) Assume that the language R is regular and that the languages N1 and N2 are not regular. Remember that o is the concatenation operator. (a) If RN1=L, what can you say about whether L is regular or not? (b) If N1N2=L, what can you say about whether L is regular or not? (c) If RL=N1, what can you say about whether L is regular or not