Daily return on a stock can be calculated as $($t is today and t$-1$ is yesterday$)$

Question $2$Select one or more:

a$.$

P$($t$)/$P$($t$-1)-1$

b$.$

$($P$($t$)-$P$($t$-1))/$P$($t$-1)$

c$.$

P$($t$-1)/$P$($t$)-1$

d$.$

$($P$($t$-1)-$P$($t$))/$P$($t$)$