With reference to the salt regulation mechanisms in Indian mangrove species, consider the following statements: 1. Salt-excluding species (e.g., Rhizophora) prevent salt from entering their root systems through a highly effective ultrafiltration mechanism in their cell membranes. 2. Salt-secreting species (e.g., Avicennia) absorb salt but actively excrete it through specialized salt glands located on their leaves. 3. Salt-accumulating species store excess salt in older leaves, which are subsequently shed in a process known as senescent leaf drop. Which of the statements given above are correct?

Options:

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

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