The correct option, git checkout -- filename, discards changes in a specific file before staging. It reverts the file to the last committed state. git reset HEAD filename unstages changes, git restore filename is used after staging, and git revert filename is for creating a new commit to undo changes.

Integrating Git with an Integrated Development Environment (IDE) provides visual tools for conflict resolution. Developers can easily view and resolve conflicts, making the process more intuitive and efficient.

The advanced technique in Git to combine multiple commit histories into a single unified history is 'Git rebase.' It allows you to reapply commits on top of another branch, resulting in a cleaner and more linear commit history. This can be useful in creating a streamlined and comprehensible project history.

The git-svn option allows for a smooth transition from SVN to Git, preserving historical branches and tags. It maintains compatibility during migration.

Large binary files can be efficiently managed using Git LFS (Large File Storage). Git LFS is an extension that replaces large files in a repository with tiny pointer files while storing the actual file contents on a separate server. This helps in handling binary files more effectively.