Which of the following is a correctly balanced reaction equation? Make sure all the compounds are correctly formed.
CaCl₂ + NaOH --> NaCl₂ + Ca(OH)
CaCl₂ + 2NaOH --> 2NaCl + Ca(OH)₂
CaCl₂ + NaOH --> NaCl + Ca(OH)₂
2CaCl₂ + 4NaOH --> 4NaCl + 2Ca(OH)₂