In order for harmony to occur in music at least two must be sounded at the same time A) pitches
B) sharps
C) instruments

this musical excerpt is an example of piano volume. (true) !

lithograph is created by etching the flat surface of a print.

cad, or computer-aided design and drafting (cadd), is a software for design and technical documentation, which is an automated process as opposed to the manual drawing of plans. this gives a person an advance in making plans as an architect in a short period of time. one who can render plans through this software will gain a skill that is better than one who makes plans manually. this is a skill some companies look for in an employee.