 
 <translate> A valid contract has to be?
Options:
- signed
- revised
- rejected
- written in blood
- written on paper
Let's think carefully first. Step-by-step reasoning process: <hau> Dole ne a yi kwangila mai inganci? Zaɓuɓɓuka: - sanya hannu - sake dubawa - an ƙi - an rubuta shi da jini - rubuta a kan takarda Bari mu yi tunani sosai da farko. Tsarin tunani mataki-mataki: 