Identify the correct statement$(s)$ regarding lenticels.

The presence of cambium in the vascular bundles provides them the ability to

$I.$ Annual rings are formed as a result of seasonal environmental conditions.
$II.$ Tracheids/vessel elements are larger during periods when water is abundant.
$III.$ Tracheids/vessel elements have thicker walls during periods of water deprivation.
$IV.$ Wood formed in previous years is always darker than newer wood.
Select the combination of correct statements from the options given below.

Cork cells are

Wood is a common name of

Suberin is primarily deposited in the cells of ..........