The first formed primary phloem is referred as ...$A$... The later formed primary phloem is referred as ...$B$...

Choose the correct combination of $A$ and $B$

  • A

    $A-$ protoxylem; $B-$ metaxylem

  • B

    $A-$ protophloem; $B-$ sieve tube cells

  • C

    $A-$ metaphloem; $B-$ sieve tube cells

  • D

    $A-$ protophloem; $B-$ metaphloem

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