blocking directory browsing

Working on securing my site. Doing this and that.
One wordpress information site said to block directory browsing you are to put this line of code in the file…
.htaccess
Options All -Indexes

I ended up with a server error.
More research… I found slightly different information on another site that was about wordpress security as well and it said to put.

.htaccess
Options -Indexes

No error came up after removing the “All”. But…is it really correct?

Just double checking.