Moira and Bonolo agree that Bonolo will do Moiras nails on the 15th of December at 14:00 at Moiras house in Centurion after Moiras appointment with Doctor Zee. Moira totally forgets about the appointment and visits her mother at Age with Pride old age home. Which form of breach of contract did Moira commit?

a.

Positive malperformance.

b.

Mora debitoris.

c.

Mora creditoris.

d.

Prevention of performance.