Which one of the following is a formal definition?

Which one of the following is a formal definition?
 
  a) Friendship is companionship.
  b) Friendship is a relationship between non-family members who care for one another.
  c) Friendship is like an anchor that keeps a person from drifting during the storms of life.
  d) Friendship is what I have with my best friend.

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Ques. 2

A formal definition of a word involves telling
 
  a) what group it belongs to and how it differs from the group.
  b) what group it belongs to and how it is the same as the rest of the group.
  c) the dictionary definition of the word.
  d) at least one synonym of the word.

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Ques. 3

Which of the following pairs of words are synonyms?
 
  a) there/their
  b) large/small
  c) large/big
  d) where/were

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Ques. 4

All of the following words might need a definition except
 
  a) tachycardia.
  b) freedom.
  c) sucker dope.
  d) ball-point pen.

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Ques. 5

Definitions are necessary when
 
  a) a word is unclear.
  b) a word is technical.
  c) the meaning of a word is in dispute.
  d) all of the above.