Correct option is C
Butt weld is also called groove weld. It is provided when the members to be jointed are lined up (in one plane) (butt joint)
In Slot weld fillet welding is made along the periphery of hole
In Plug welds small holes are made in one plate and is kept over another plate to be connected & then entire hole is filled with filler material.
Fillet welds are provided when two members to be jointed are in different place (lap joint)
S Groove weld A groove weld is made in a prepared groove between two members, typically with a V. U or J shape. It provides a strong and full penetration weld.
