A frog mutant was found in which oocytes developed normally at $30$oC following fertilization, but did not develop at all at $37$oC$.$ Examination of RNA in the fertilized oocyte at $37$oC showed the absence of polyadenylated mRNA A$.$ Mutations in which of the following elements in the oocyte could account for these observations? You may choose one or more answers. Write a brief explanation for your choice$($s$).($a$)$ eIF$4$E $($the CAP$-$binding protein$)($b$)$ An amber mutation in the gene coding for Maskin protein $($c$)$ The UUUUAU sequence $($CPE$)$ in an essential mRNA $($d$)$ The CPE$-$binding protein $($CPEB$)($e$)$ eIF$4$G $($the "scaffolding protein" that binds the CAP$-$binding protein$)($f$)$ The AAUAAA sequence $($poly$($A$)$ addition signal$)$ in an essential mRNA $($g$)$ The cytoplasmic poly$($A$)$ polymerase $($PAP$)($h$)$ PABP$1($cytoplasmic poly$($A$)$ binding protein $1)($i$)$ none of the above