A new collection of this political leader's letters from prison was released in 2018, five years after his death. This leader's 1994 autobiography was entitled, Long Walk to Freedom, and detailed his 27 year imprisonment by the white minority government of his nation. This founder of the African National Congress was found guilty in the Rivonia Trial in 1964, leading to his imprisonment at Robben Island for 18 of his 27 years. For 10 points, name this South African leader, a symbol of resistance to the apartheid government of South Africa, who was elected president in 1994.
a) Nelson Mandela
b) Desmond Tutu
c) Thabo Mbeki
d) F. W. de Klerk