A)trans- acting elements that bind to mRNA to either degrade or stabilize mRNA B)trans- acting elements that bind to mRNA to recruit ribosomes to mRNA for translation initiation C)cis- acting elements where ribosomes bind to in order to initiate translation D)cis- acting elements that recruit RNA- binding proteins to mRNA to either degrade or stabilize the mRNAs E)trans- acting elements that block mRNA splicing