Vascular bundle with cambium is called

Choose the incorrect statement.

Vascular bundles in which phloem is found on both sides of xylem are called:

Which of the following vascular bundles are always open?

$A$ vascular bundle in which a group of xylem and a group of phloem are on the same radius with xylem near the pith and phloem near the cortex and both are not separated by the cambium,is called:

Epithem is: