Affirmative Duty Based on Statutory Provisions Imposing Obligations to Protect Another § 39. Duty Based on Prior Conduct Creating a Risk of Physical Harm § 40. Duty Based on Special Relationship with Another § 41. Duty to Third Parties Based on Special Relationship with Person Posing Risks § 42. Duty Based on Undertaking § 43. Duty to Third Parties Based on Undertaking to Another § 44. Duty to Another Based on Taking Charge of the Other