\( \definecolor{colordef}{RGB}{249,49,84} \definecolor{colorprop}{RGB}{18,102,241} \)
Describe explicitly in \(\mathbb{R}\) or \(\mathbb{C}\):
  1. \(B(2, 1)\) and \(\overline{B}(2, 1)\) in \(\mathbb{R}\).
  2. \(B(0, 1)\) and \(S(0, 1)\) in \(\mathbb{C}\).
  3. \(B(2, 1) \cap [0, 3]\) in \(\mathbb{R}\).

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