Explain the differences between the $1s$ and $2s$ orbitals based on their probability density plots and radial distribution.

• A
  The $1s$ orbital has no radial nodes,while the $2s$ orbital has one radial node.
• B
  The $1s$ orbital has one radial node,while the $2s$ orbital has no radial nodes.
• C
  Both $1s$ and $2s$ orbitals have the same number of radial nodes.
• D
  The $2s$ orbital is smaller in size than the $1s$ orbital.