There exists a table called 'patient_details', in a database 'hospital.db'. 'xyz' is the connection string and 'abc' is the cursor object created to interact with the db. Choose the option that retrieves all of the data from the patient_details table
pd.read_sql("Select * from patient_details",abc)
pd.read_sql("Select * from patient_details",xyz)
pd.read_sql("Select * from patient_details", hospital.db, xyz)
pd.read_sql("Select * from patient_details", hospital.db, abc)
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