In the sentence below, five highlighted words have been placed in the sentence. Four of them are incorrectly placed and need to be swapped, while only ONE word is already in its correct position. Choose the option that indicates the word that is correctly placed. Engineers overhaul solar panels to regulate clean electricity, generate power storage systems, maintain grid stability, and optimize aged machinery regularly.

·         'maintain' is the only verb in its correct position: "maintain grid stability". ·         The remaining four words are misplaced and need to be swapped as follows: ·         overhaul optimize (optimize solar panels) ·         regulate generate (generate clean electricity) ·         generate regulate (regulate power storage systems) ·         optimize overhaul (overhaul aged machinery regularly) ·         Corrected Sentence:
"Engineers optimize solar panels to generate clean electricity, regulate power storage systems, maintain grid stability, and overhaul aged machinery regularly."