Which of the following copy notations should the writer include ...

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Which of the following copy notations should the writer include at the bottom of a letter to send a copy of the letter to another individual with the recipient's knowledge?
 a. sig
  b. Enc
  c. c:
  d. P.S.

Question 2

The first dental engine with functioning handpiece, motor, and foot treadle was invented by Horace Hayden.
 a. True
  b. False
 Indicate whether the statement is true or false

[stillxalice]

Answer to Question 1

c

Answer to Question 2

False
RATIONALE: The first dental engine with functioning handpiece, motor, and foot treadle was invented by James Morrison.