Precaution – working inside a MacBook Pro (13-inch, Mid 2010)

Which of the following is a valid precaution you should take when you begin working inside a MacBook Pro (13-inch, Mid 2010)?
A. Reset the SMC.
B. Remove the hard drive.
C. Disconnect the optical drive.
D. Disconnect the main battery.
[toggle title_open=”Close Me” title_closed=”Answer” hide=”yes” border=”yes” style=”default” excerpt_length=”0″ read_more_text=”Read More” read_less_text=”Read Less” include_excerpt_html=”no”]D[/toggle]