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How can I disable single option of checkboxes in drupal 8

I am using domain access module in Drupal 8. I want to disable one option/site in domain access settings in node edit page . I am trying to disable through hook_node_form_alter. Following is my array in node form alter

Array ( 

[widget] => Array     (         [#title] => Domain Access         [#description] => stdClass Object             (                 [__CLASS__] => DrupalCoreFieldFieldFilteredMarkup                 [string] => Select the affiliate domain(s) for this content             )          [#field_parents] => Array             (             )          [#required] => 1         [#delta] => 0         [#weight] => 0         [#element_validate] => Array             (                 [0] => Array                     (                         [0] => DrupalCoreFieldPluginFieldFieldWidgetOptionsButtonsWidget                         [1] => validateElement                     )              )          [#key_column] => target_id         [#type] => checkboxes         [#default_value] => Array             (                 [0] => site1                 [1] => site3             )          [#options] => Array             (                 [master] => stdClass Object                     (                         [__CLASS__] => DrupalCoreFieldFieldFilteredMarkup                         [string] => Master                     )                  [site1] => stdClass Object                     (                         [__CLASS__] => DrupalCoreFieldFieldFilteredMarkup                         [string] => Site 1                     )                  [site2] => stdClass Object                     (                         [__CLASS__] => DrupalCoreFieldFieldFilteredMarkup                         [string] => Site 2                     )                  [site3] => stdClass Object                     (                         [__CLASS__] => DrupalCoreFieldFieldFilteredMarkup                         [string] => Site 3                     )                  [site4] => stdClass Object                     (                         [__CLASS__] => DrupalCoreFieldFieldFilteredMarkup                         [string] => Site 4                     )              )

)

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How can I disable single option of checkboxes in drupal 8

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