You don't have to login it is not mandatory.
a mandatory sign - you have to obey it.
Education is mandatory in many countries.It is mandatory that you attend this meeting.
because they are mandatory signs
I believe it was a sign in the ant colony in The Once and Future King by T.H. White. Well, the sign said that which is not forbidden is mandatory, if i recall correctly - it's been years.
Education is mandatory in many countries.It is mandatory that you attend this meeting.
Education is mandatory in many countries.It is mandatory that you attend this meeting.
Mandatory Insurance
It is not mandatory but in most cases it is appropriate for a model to sign a release, especially if you are a photographer and want to protect your images.
Mandatory Insurance -(APEX)
test lead, technical lead
its not mandatory but it is a sign of respect for the life he/she lived