Final answer:
DiGeorge syndrome is a primary immunodeficiency due to genetics and not an example of secondary immunodeficiency. Conditions such as HIV/AIDS, chronic lymphocytic leukemia, and malnutrition are examples of secondary immunodeficiencies.
Step-by-step explanation:
The student's question pertains to examples of secondary immunodeficiencies. Secondary immunodeficiencies are acquired conditions that result in the impairment of immune functions following birth due to various causes such as malnutrition, infections, or exposure to harmful chemicals or radiation. On the other hand, primary immunodeficiencies are genetic disorders present at birth and can significantly impair the immune system's capabilities.
Therefore, the correct answer to the question 'All but which one of the following are examples of secondary immunodeficiencies?' is:
d) DiGeorge syndrome. DiGeorge syndrome is a primary immunodeficiency caused by a genetic abnormality. The other listed conditions, such as HIV/AIDS, chronic lymphocytic leukemia (CLL), and malnutrition, are all causes of secondary immunodeficiencies.