Question About K visa

Immigrant Visa for a Spouse (IR1 or CR1)
Nonimmigrant Visa for a Spouse (K-3)
Nonimmigrant Visa for a Fiancé(e) (K-1)
 
A friend of mine is married to an american citizen for a period of two years now.
The wife stays in another country and the husband in usa. however they visit one another frequently.
Now the wife would like to join the husband permanently since the husband was invloved in a bad accident.
What is the step to obtaining the visa. They wedded in usa
 
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