Study the following statements and identify the correct combinations of statements.

Statements:

​(A): Accuracy refers to the degree of perfection obtained in the measurement or how close the measurement is to the true value. When the accuracy of a survey is to be improved or increased, we say that greater precision must be used. 

(B): Precision refers to the degree of perfection used in the instruments, methods, and observations- in other word, to the level of refinement and care of the survey. 

(C): Precision – Degree of perfection obtained in the results.

(D): Accuracy – Degree of perfection used in the survey.