How do i say the last one in english

What conditions must be met before you can use the subjunctive? a) you must have two verbs in the same sentence. b) you must use a wedding verb. c) you must have a wedding verb in the first clause and another verb in the sentence. d) you must have a wedding verb in the first clause and a new subject for the second verb.

Comment s'appelle la personne qui prend les commandes des clients dans un restaurant

Choose the best translation of the following sentence.i know what is happening.je sais que arrive.je sais ce que arrive.je sais qui arrive.je sais ce qui arrive.