Which One of the Following Statements Concerning the Use of Internal

Which one of the following statements concerning the use of internal control materials is incorrect?

A) Use of control materials can aid in the identification of assay malfunctions that lead to unreliable data.
B) Serum controls are prepared from human serum pools and are analyzed in analytical runs that are separate from patient samples.
C) QC data are collected over a period of time and statistically analyzed using measures of central tendency.
D) Controls that exceed specific limits are examined with the Westgard rules to determine what kind of error is present and what actions are to be taken.