Mark the following statements as true/false and choose the correct option from the codes given below:
$I.$ Neuroglial cells are the packing and supporting cells found in the brain and spinal cord.
$II.$ Oligodendrocytes are a category of glial cells that form myelin sheaths around the axon.
$III.$ Microglia provide mechanical support to the neurons.
$IV.$ Astrocytes communicate with one another through potassium channels.

• A
  $I-$ True,$II-$ True,$III-$ False,$IV-$ False.
• B
  $I-$ False,$II-$ True,$III-$ True,$IV-$ False.
• C
  $I-$ False,$II-$ False,$III-$ True,$IV-$ True.
• D
  $I-$ True,$II-$ False,$III-$ True,$IV-$ False.