Which of the following statements is true for phloem in plants?

1. A. Phloem fibres are made up of collenchymatous cells
2. B. Sieve tube elements are multicellular with wide lumen and rich cytoplasm.
3. C. Companion cells help in maintaining the pressure gradient in sieve tubes.
4. D. Phloem parenchyma is abundantly present in monocots

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