如何在visualforce页上将多选选择列表呈现为复选框

<apex:page>
    <apex:form>
        <apex:selectCheckboxes value="{!selectedOptions}">
            <apex:selectOptions value="{!options}"/>
        </apex:selectCheckboxes>
        <apex:commandButton value="Submit" action="{!submit}"/>
    </apex:form>
</apex:page>

public class MyController {
    public List<String> selectedOptions { get; set; }
    
    public List<SelectOption> getOptions() {
        List<SelectOption> options = new List<SelectOption>();
        options.add(new SelectOption('Option 1', 'Option 1'));
        options.add(new SelectOption('Option 2', 'Option 2'));
        options.add(new SelectOption('Option 3', 'Option 3'));
        return options;
    }
    
    public void submit() {
        // 处理提交操作
    }
}