Select the most appropriate option to substitute the underlined segment in the given sentence. If there is no need to substitute it, select ‘No substitution required.’

Q:

A tigress has given birth to a cub in the Ranthambore Tiger Reserve, taking the big cat population to 78.

• 1
  no substitution required
• 2
  is given births
• 3
  was birthed
• 4
  has give birth