A square courtyard measures 20 m on each side. The school plans to surround it with a uniform strip of paving so that the combined area of the courtyard and the paving becomes 350 m². Which of the following is correct?
(a) The paving will be approximately 0.65m wide.
(b) The paving will be approximately 3.7m wide.
(c) Such a paving strip cannot be laid with a positive width.
(d) The paving will be approximately 1.3m wide.