Ranking from fast to slow .. interview question

[GoDaddy]

I just had a technical interview ...

I had to rank from fastest to slowest ...

1)

for( int i =0;i<16;i++)
   array1[i] = array2[i];

2)

for(int i=0;i<16;i++)
    (int)array1[i] = (int)array2[i];

3)

memmove(dest,src,16);

4)

for(int i=0;i<16;i++)
  for(int j=0;j<16;j++)
      array1[i]=array2[j];

My answer : 3,1,2,4

Was it right ?