What does BTC stand for? [kpop related question]

The energy applied to cause vibration can be in the form of air pressure a stick, bow, or electricity. true or fasle

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

It is important to avoid doing too much editing to a photograph true or false