An inappropriate screen name typically includes offensive language, personal information, or anything that might be considered disrespectful or unprofessional.
Based on the options provided, none of the names appear to be overtly inappropriate in that context, but "Zipp3rTigg3r" may raise suspicions due to the use of numbers in place of letters, which can sometimes suggest a more informal or childish tone compared to the others. However, this alone does not necessarily make it inappropriate.
If there’s a specific context or criteria for what makes a screen name inappropriate, that information would be helpful in determining the best answer.