Consider the following method, which is supposed to return the value of the largest element in an array of integers:

I$/$ Precondition: a$.$length $>0$

public int findMax$($int$[]$ a$)$

$1$

int max$=a[0]$;

for $($int $i=1$;$ia.$ length; $i++)$

$1$

if $)>(max$

max$=a[i]$;

$\}$

return max;

$//$ Line $1$

IT Line $2$

$//$ Line $3$

$//$ Line $4$

$//$ Line $5$

$\}$

Unfortunately it has two bugs. On which lines?

A$.$ Line $1$ and Line $2$

B$.$ Line $2$ and Line $3$

C$.$ Line $2$ and Line $4$

D$.$ Line $1$ and Line $3$