7. Sara wants to show that ((a ) ca ( c). Yasmina says that it is impossible and comes up with three sets of vectors to prove Sara wrong. Which Yasmina's sets of vectors prove Sara's statement to be correct? Explain with words and math. [4C]

i. = (1, 0, 0), = (0, 1, 0), = (0, 0, 1)

ii. = (1, 1, 0), = (1, 1, 0), = (0, 0, 1)

iii. = (1, 0, 0), = (1, 1, 0), = (1, 1, 1)