Initiation codon of protein synthesis (in eukaryotes) is

How many genetic codes specify the amino acid proline?

Whose experiments cracked the $DNA$ and discovered unequivocally that a genetic code is a "triplet"?

Assertion : $UAA, UAG$ and $UGA$ terminate protein synthesis.
Reason : They are not recognised by $tRNA$.

Select the incorrect statement$(s)$.
$i.$ Six codons do not code for any amino acid.
$ii.$ Codon is read in $mRNA$ in a contiguous fashion.
$iii.$ Three codons function as stop codons.
$iv.$ The initiation codon $AUG$ codes for methionine.

In the genetic code,$61$ codons code for $20$ different types of amino acids. This is called: