Explanation
About Altering the Default Full Data Redaction Value
You can alter the default displayed values for full Data Redaction polices. By default, 0 is the redacted value when Oracle Database performs full redaction (DBMS_REDACT.FULL) on a column of the NUMBER data type. If you want to change it to another value (for example, 7), then you can run the DBMS_REDACT.UPDATE_FULL_REDACTION_VALUES procedure to modify this value. The modification applies to all of the Data Redaction policies in the current database instance. After you modify a value, you must restart the database for it to take effect.
Note:
* The DBMS_REDACT package provides an interface to Oracle Data Redaction, which enables you to mask (redact) data that is returned from queries issued by low-privileged users or an application.
* UPDATE_FULL_REDACTION_VALUES Procedure
This procedure modifies the default displayed values for a Data Redaction policy for full redaction.
* After you create the Data Redaction policy, it is automatically enabled and ready to redact data.
* Oracle Data Redaction enables you to mask (redact) data that is returned from queries issued by low-privileged users or applications. You can redact column data by using one of the following methods:
/ Full redaction.
/ Partial redaction.
/ Regular expressions.
/ Random redaction.
/ No redaction.

incorrect:
Not A:To create a bigfile tablespace, specify the BIGFILE keyword of the CREATE
TABLESPACE statement (CREATE BIGFILE TABLESPACE ...). Oracle Database
automatically creates a locally managed tablespace with automatic segment space
management.
You can specify SIZE in kilobytes (K), megabytes (M), gigabytes (G), or terabytes (T).
Not D:Although automatic segment space management is the default for all new
permanent, locally managed tablespaces, you can explicitly enable it with the SEGMENT
SPACE MANAGEMENT AUTO clause.

http://docs.oracle.com/cd/E16655_01/server.121/e17636/cdb_admin.htm

A - TRUE
The higher the power limit, the more quickly a rebalance operation can complete. Rebalancing takes longer with lower power values, but consumes fewer processing and I/O resources which are shared by other applications, such as the database.
C - TRUE
Grouping operations in a single ALTER DISKGROUP statement can reduce rebalancing operations.
http://docs.oracle.com/cd/E11882_01/server.112/e18951/asmdiskgrps.htm#OSTMG10070 E - FALSE Otherwise, derived from the values of PARALLEL_MAX_SERVERS, PARALLEL_THREADS_PER_CPU, CLUSTER_DATABASE_INSTANCES, DISPATCHERS, and BWR_IO_SLAVES.
Note that a value derived in this way does not take into account the requirements used for Oracle Automatic Storage Management (Oracle ASM) files

AEF
Explanation:
Manually Sized SGA Components that Use SGA_TARGET Space
SGA Component, Initialization Parameter
/ The log buffer
LOG_BUFFER
/ The keep and recycle buffer caches
DB_KEEP_CACHE_SIZE
DB_RECYCLE_CACHE_SIZE
/ Nonstandard block size buffer caches
DB_nK_CACHE_SIZE
Note:
* In addition to setting SGA_TARGET to a nonzero value, you must set to zero all initialization parameters listed in the table below to enable full automatic tuning of the automatically sized SGA components.
* Table, Automatically Sized SGA Components and Corresponding Parameters