Which of the Following Is a Principle of the ALARA

Which of the following is a principle of the ALARA concept?

A) All diagnostic x-ray exposure is low energy and of little concern.
B) The radiographer should hold a standard number of patients per year as long as it is below the allowable limits.
C) X-ray doses can increase progressively to allowable limits on older patients.
D) The radiographer's occupational exposure should be kept as low as reasonably achievable.