The CONTACT_DATE column Stores the date of a patient encounter. which of the following could be used to return how many days ago an encounter was? Assume all encounters are in the past. Trailing information is okay in Oracle. The number of days ago should be displayed by a positive number.

A) In Oracle: ADD_MONTHS(CURRENT_TIMESTAMP, CONTACT_DATE) / 31 In SQL Server: DATEADD(m, CONTACT_DATE, CURRENT_TIMESTAMP) / 31 B) In Oracle: CURRENT_TIMESTAMP - CONTACT_DATE In SQL Server: DATEDIFF(d, CONTACT_DATE, CURRENT_TIMESTAMP) C) In Oracle: ADD_MONTHS(CONTACT_DATE,CURRENT_TIMESTAMP, ) / 31 In SQL Server: DATEADD(m, CURRENT_TIMESTAMP, CONTACT_DATE ) / 31 D) In Oracle: CONTACT_DATE - CURRENT_TIMESTAMP In SQL Server: DATEDIFF(d, CURRENT_TIMESTAMP, CONTACT_DATE)