Consider the following statements regarding the structural organization of mitochondria: 1. The outer membrane contains large numbers of integral membrane proteins called porins, making it highly permeable to small molecules. 2. The inner membrane is selectively impermeable and contains cardiolipin, which makes it highly impermeable to ions. 3. The enzymes of the citric acid (Krebs) cycle are entirely located in the inner mitochondrial membrane. Which of the statements given above are correct?

Options:

• A: 1 and 3 only
• B: 1 and 2 only
• C: 2 and 3 only
• D: 1, 2 and 3

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