以下哪项是mongo聚合中流水线操作的正确顺序？( )
$project, $match, $group, $sort, $skip, $limit, $unwind
$match, $group, $project, $sort, $skip, $limit, $unwind
$sort, $match, $group, $project, $skip, $limit, $unwind
$sort, $match, $group, $project, $skip, $limit, $unwind
