Who likes "Mood swings" (feat. Lil Tjay) by pop smoke. i do

Atypical scale usually consists of one of pitches. 1. rhythm 2. octave 3. key 4. series

Silverpoint is a. a technique using the blackish residue of impure carbon obtained by removing water from animal and vegetation substances. b. a technique involving the use of a metal point, and a thin silver wire, popular in the 14th and 15th centuries. c. a printmaking technique born from crayon manner that imitates the appearance of chalk lines. d. a technique used since the 16th century involving a stick filled with either colored or black graphite, a heated mixture of carbon and clay

What is the name of the above note? a b c d