Question

read the following sentence: all students who are not registered will be sent to the back of the elective course line. identify the relative clause, whether it is essential to the meaning of the sentence, and if it requires commas. the clause is \who are not registered.\ it is non - essential. it does require a comma. the clause is \to the back of the elective course line.\ it is non - essential. it does require a comma. the clause is \who are not registered.\ it is essential. it does not require a comma. the clause is \to the back of the elective course line.\ it is essential. it does not require a comma.

Explanation:

The relative clause "who are not registered" defines which students will be sent to the back of the line. Without it, the meaning of the sentence would change. Essential relative clauses do not require commas. The phrase "to the back of the elective course line" is not a relative clause.

Answer:

The clause is "who are not registered."
It is essential.
It does not require a comma.