Which of the following statements are correct?
$I.$ Plants collected during field studies are pressed and dried on herbarium sheets.
$II.$ The label on the right-hand side of the herbarium sheet contains the scientific name,family,and common name of the plant.
$III.$ Botanical gardens contain collections of plant specimens as well as illustrations,slides,maps,and photographs.
$IV.$ Living plants can be observed and identified in botanical gardens.

• A
  $I, III$
• B
  $II, III$
• C
  $I, II$
• D
  $III, IV$