$.$Simple Mode Have the function SimpleMode$($arr$)$ take the array of numbers stored in arr and return the number that appears most frequently $($the mode$).$ For example: if arr contains $[10,4,5,2,4]$ the output should be $4.$ If there is more than one mode return the one that appeared in the array first $($ie$.[5,10,10,6,5]$ should return $5$ because it appeared first$).$ If there is no mode return $-1.$ The array will not be empty. Be sure to use a variable named varFiltersCg