which scenario is parfect for editting a combo box, Grid Panel, ExtJS

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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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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' });

B

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' });