During protein synthesis which part of RNA is joined together to form a sequence for a functional protein? Exons, introns, both exons neither exons or introns

During protein synthesis the exons are joined together to form a sequence of for a functional protein.

Before the mRNA can undergo the process of translation in the cytoplams it undergoes a process called RNA splicing. This process produces a 'final draft' of the mRNA before translation gets under way. The process involves the removal of introns (non-coding sequences) and joining of exons in eukaryotic mRNA.

Exons are correct for this question, for those who apparently couldn't understand what he/she was saying.