Aparabola is represented by the equation y=x^2+6x-17

There's 2 types of intaglio printing etching and engraving what's the primary difference between the 2

A-the artist carves the design directly in etching while in engraving its done by using acid to cut into the plate
B - the artist carves the design directly in engraving while in etching its done by using cut into the plate
C-you can feel the raised edges of the ink on an itching but not in engraving