What would be the outcome?

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Evaluate the following query:
SQL> SELECT TRUNC (ROUND(156.00, -1),-1)
FROM DUAL;
What would be the outcome?

A.
150

B.
200

C.
160

D.
16

E.
100

Explanation:
https://docs.oracle.com/cd/B19306_01/server.102/b14200/functions135.htm
https://docs.oracle.com/cd/B28359_01/olap.111/b28126/dml_functions_2127.htm

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