Read the following information carefully and answer the question given it.
′P+Q′ means 'P is a sister of Q'
′P−Q′ means 'P is the mother of Q'
′P×Q′ means 'P is the brother of Q'
′P÷Q′ means 'P is the father of Q'
Which of the following means that 'A is the paternal uncle of B'?