Consider the following statements related to Thomas Malthus's theory:

A) Malthus argued that population grows exponentially while food supply grows arithmetically.
B) Physical checks like famine and war were considered unavoidable by Malthus.
C) Malthus supported preventive checks such as family planning and delayed marriage.
D) According to Malthus, technological progress would prevent food shortages permanently.

Which of the above statements are correct?