Materials question doubt about mechanical materials

hi everyone

can someone help me with this 2 question of materials?

1) What technology does NOT allow to produce an aluminum tube of 100 mm in length and 40 mm of diameter: A) Pulverotecnologia; B) Profiling; C) Stamping; D) Mandrel drawing

2)A welding process with high energy density can be: A) MIG B) MAG C) Laser D) Coated electrodes

the first question i've no idea but the secund i think it's C or D