Read this sentence
My first term paper, which is due next month, must be at least ten pages long.
Identify the relative clause, whether it is essential to the meaning of the sentence, and if it requires commas.

Select one:
O a. The clause is "My first term paper."
It is essential
It does not require a comma.
O b. The clause is "My first term paper."
It is non-essential
It does require a comma.
O c. The clause is "which is due next month."
It is essential
It does not require a comma.
d. The clause is "which is due next month."
It is non-essential
It does require a comma.