Question:Which scenario is parfect for editting a combo box? 

A 
var genre_edit = new Ext.form.ComboBox({
 typeAhead : true,
 triggerAction :'all',
 mode : 'local', 
 store : 'genres',
 displayField : 'genre',
 valueField : 'id'
});
 

B 
var genre_edit = new Ext.form.ComboBox({
 typeAhead : true,
 triggerAction :'all',
 mode : 'local', 
 store : genres,
 displayField : 'genre',
 valueField : 'id'
});
 

C 
var genre_edit = new Ext.form.ComboBox({
 typeAhead : 'true',
 triggerAction :'all',
 mode : 'local', 
 store : genres,
 displayField : 'genre',
 valueField : 'id'
});
 

D 
var genre_edit = new. Ext.form.ComboBox({
 typeAhead : true,
 triggerAction :'all',
 mode : 'local', 
 store : genres,
 displayField : 'genre',
 valueField : 'id'
});
 

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