贾某为某电子科技公司董事长和法定代表人，后因管理和经营问题，电子科技公司陷入舆论危机，今年1月，该电子科技公司董事会进行改选，由孙某担任公司董事长和法定代表人。对于贾某担任该电子科技公司法定代表人时期签订的合同，（ ）。

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