Given the following C function, the function is designed to "combine" two strings together by alternately taking the characters from the two strings. For example, calling the function to combine "ABC" and "def" should return "AdBeCf". char $*$zip$($char $*$a$,$ char $*$b$)\{$ char $*$result; int len, i; len $=$ strlen$($a$)$; result $=$ malloc$(2*$ len$)$; for $($i $=0$; i $<$ len; i$++)\{$ result$[2*$ i$]=$ a$[$i$]$; result$[2*$ i $+1]=$ b$[$i$]$; $\}$ return result; $\}$ int main$()\{$ char $*$a $="..."$; char $*$b $="..."$; char $*$merged $=$ zip$($a$,$ b$)$; printf$("$Merged string: $\%$s

$",$ merged$)$; return $0$; $\}$ A$.$ Is this function implemented securely$?$ Give an explanation. B$.$ Provide a safer implementation for this function. Give an explanation.