(Solved): please answer both questions or leave for next tutor. Which of the following languages is the produc ...

Which of the following languages is the product \( \left.\left\{a^{n} b \mid n>=0\right\} c^{n} \mid n>=0\right\} \) \[ \begin{array}{l} \left\{a^{n} b c^{m} \mid n>=0, m>=0\right\} \\ \left\{a^{n} b c^{n} \mid n>=0\right\} \\ \left\{a^{n} b^{m} c^{n} \mid n>=0, m>=0\right\} \\ \left\{a^{n} b^{n} c^{n} \mid n>=0\right\} \end{array} \] QUESTION 4 For the language \( \mathrm{L}=\left\{a^{n} b^{m} \mid n>=0, m>0\right\} \), which one of the following strings is not a part of the language? ab acb \( \operatorname{acccc} \) acccccccccecb