Given a data frame named 'product' with column names $[\text{'}$c$1\text{'},\text{'}$c$2\text{'},\text{'}$c$3\text{'}],$ how to select the columns $\text{'}$c$2\text{'}$ and $\text{'}$c$3\text{'}?$

product $[\text{'}$c$2\text{'},\text{'}$c$3\text{'}]$

product.iloc$[$:$,[\text{'}$c$2\text{'},\text{'}$c$3\text{'}]]$

product.loc$($:; $[\text{'}$c$2\text{'},\text{'}$c$3\text{'}])$

product.loc$[$:$,[\text{'}$c$2\text{'},\text{'}$c$3\text{'}]]$