The first question is B.), acronym, and the second one is c.) acrostic.
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Answer:
Android: Tap and hold the text you're entering in the text field, then choose Bold, Italic, or More . Tap More to choose Strikethrough or Monospace. iPhone: Tap the text you're entering in the text field > Select or Select All > B_I_U. Then, choose Bold, Italic, Strikethrough, or Monospace.
Explanation: