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A is corrent because lien creditors have priority over any unperfected security interest and any security interest perfected after the lien has attached.
B is incorrect because a perfected security interest is superior to Cross’s unperfected security interest unless the perfected party had knowledge of Cross’s interest prior to perfection.
C is incorrect because Cross may also perfect by taking possession of the property, Safe’s inventory. This could be done under a field warehousing arrangement.
D is incorrect because Cross’s failure to perfect does not affect his rights against Safe. By not perfecting, Cross does not obtain the best possible rights in the collateral in relation to third parties.