What is the result of the following code?

data $=$ pd$.$Series$([0\mathrm{.}25,0\mathrm{.}5,0\mathrm{.}75,1\mathrm{.}0],$ index$=[\text{'}$a$\text{'},\text{'}$b$\text{'},\text{'}$c$\text{'},\text{'}$d$\text{'}])$

data$[\text{'}$a$\text{'}$:$\text{'}$c$\text{'}]$

The values associated with $\text{'}$a$\text{'},\text{'}$b$\text{'},$ and $\text{'}$c$\text{'}$

Only the value associated with $\text{'}$a$\text{'}$

An error, as the slicing is incorrect

The values associated with $\text{'}$a$\text{'}$ and $\text{'}$b$\text{'}$ only