Consider the following command:  Backup database plus archivelog delete input;  How many backup sets would be created by this command if the following were true:()  Control-file a NN uto backups were enabled.  NN The size of backup sets was not restricted.  NN One channel was allocated.  
A: 1
B: 2
C: 3
D: 4
E: 5
出自:Oracle认证