Two plates, each of $6$ mm thickness, are to be butt-welded. Consider the following processes and select the correct sequence in increasing order of size of the heat affected zone.

1. Arc welding
2. MIG welding
3. Laser beam welding
4. Submerged arc welding
1. $1-4-2-3$
2. $3-4-2-1$
3. $4-3-2-1$
4. $3-2-4-1$