Adjectives/Attributive?

01. She said that the company's directors were in the 01u00director02u00 conference this morning.02br
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002. She said that the company's directors were in the 01u00directors02u00 conference this morning.02br
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003. She said that the company' directors were in the 01u00directors' 02u00conference this morning.02br
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00Hello Grammar Teacher/Teachers,02br
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001. Are all the sentences correct ?02br
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002. Could you elaborate on the differences of the underlined words,please ?02br
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00Thank you. 02br
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00With best wishes.0-