Define a conditional IF... ELSE for a boolean-specifier such as VALIDITY .opt: Optional1. First, define the "attribute" of the VARIABLE2. Second, define the conditional statement which includes either an "IF" and a "ELSE"EXAMPLEWe must reference a value of a different VARIABLE in this expression. In this particular case, we are referencing temp_type as a dependent variable in the IF-expression.