Which of the Following Statements Regarding Reliability of International Marketing

Which of the following statements regarding reliability of international marketing measures is true?

A) Reliable measures are not necessary in international studies because secondary data exist.
B) It is best to use more than one measure when measuring a concept in international contexts.
C) It is best to use one measure when measuring concepts because the measure will be valid.
D) Reliability of measures is not a concern if measures are proven to be valid.
E) If a measure is shown to be reliable, then it is not necessary to assess its validity