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Syntactic complexity in English is achieved through coordination and subordination, with specific focus on the distinction between restrictive and non-restrictive relative clauses. Based on the rules of punctuation and the use of relative pronouns in formal English, choose the CORRECT alternative.
The researchers, who ignored the safety protocols were dismissed, while the equipment that was extremely expensive remained intact.
The researchers who ignored the safety protocols were dismissed, while the equipment which was extremely expensive remained intact.
The researchers, who ignored the safety protocols, were dismissed, while the equipment which was extremely expensive remained intact.
The researchers who ignored the safety protocols were dismissed, while the equipment, which was extremely expensive, remained intact.