Which two are true about the character sets used in an Oracle database? (Choose two.) 

Answer options:

A. Single-byte character sets provide better performance than multibyte character sets.
B. Unicode enables information from any language to be stored using a single character set.
C. Unicode is the only supported character set for Oracle databases created using Database Configuration Assistant (DBCA).
D. Single-byte character sets always use 7-bit encoding schemes.
E. Multibyte character sets allow more efficient space utilization than single byte character sets.
F. Single-byte character sets always use 8-bit encoding schemes.

AB

Reference: https://docs.oracle.com/database/121/NLSPG/ch2charset.htm#NLSPG166