In Ratings Based Conjoint Analysis, how many dummy variables will be included for each attribute?

$x+2$ dummy variables, where $x$ captures the respective number of attribute levels

$x-1$ dummy variables, where $x$ captures the respective number of attribute levels

$x$ dummy variables, where $x$ captures the respective number of attribute levels.

$x^2$ dummy variables, where $x$ captures the respective number of attribute levels

$x+1$ dummy variables, where $x$ captures the respective number of attribute levels.