Which of these are valid approaches to character development in novels? （ ）

A、Showingcontradictionsinacharacter'sbehavior
B、Avoidinganyphysicaldescriptions
C、Demonstratinghowothercharactersperceivethem
D、Keepingcharacterscompletelyconsistentwithoutgrowth
E、Revealingbackstorythroughgradualdisclosure