Find t, n, and κ for the space curve {r}(t) = (cos³ t){i} + (sin³ t){j} for 0 < t < {π}/{2}.

a) t = {π}/{4}, n = {j}, κ = {√{2}}/{2}
b) t = {π}/{6}, n = {i}, κ = {√{3}}/{2}
c) t = {π}/{4}, n = {j}, κ = {√{3}}/{2}
d) t = {π}/{6}, n = {i}, κ = {√{2}}/{2}