1. $\underset{F}{\to }$

• A. ${\underset{\nabla }{\to }}_{.}{\underset{F }{\to }}_{=0}$
• B. ${\underset{\nabla }{\to }}_{.}{\underset{F }{\to }}_{=0}$
• C. ${\underset{\nabla }{\to }}_{.}{\underset{F }{\to }}_{=0}$
• D. ${\underset{\nabla }{\to }}_{.}{\underset{F }{\to }}_{=0}$

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