What does the codes below mean?

ts$1=$pd$.$to$\_$datetime$($df$\_$date$[\text{'}$TimeGenerated$\text{'}],$ format$=\text{'}\%$m$/\%$d$/\%$Y $\%$I:$\%$M:$\%$S $\%$p$\text{'})$

it is converting the "TimeGenerated" column of the ts$1$ dataframe to a DateTime data format.

it is converting the entire ts$1$ dataframe to a DateTime data format.

it is converting the entire df$\_$date dataframe to a DateTime data format.

it is converting the "TimeGenerated" column of the df$\_$date dataframe to a DateTime data format.