Which expression is equivalent to m/m - 4 + 4/4 - m/m²/m² - 16?
a) m/m - 4 + 4/4 - m/m²/m² - 16
b) m/m - 4 + 4/4 - m/m²/m² + 16
c) m/m - 4 - 4/4 - m/m²/m² - 16
d) m/m - 4 - 4/4 - m/m²/m² + 16