which is the correct config option for toolbar button in extjs, Buttons, ExtJS

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Question:Which is the correct config option for toolbar button in ExtJS

A { 
  xtype:'tbbutton',
  text:'Button'
} 
B { 
  xtype:'tbutton',
  text:'Button'
} 
C { 
  xtype:'button',
  text:'Button'
} 
D { 
  type:'button',
  text:'Button'
}

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Question:Which is the correct config option for toolbar button in ExtJS

A { xtype:'tbbutton', text:'Button' }

B { xtype:'tbutton', text:'Button' }

C { xtype:'button', text:'Button' }

D { type:'button', text:'Button' }

A