Inspiron 3580 M.2 SSD which type of keying?

Hello all,

as shown in specs Inspiron 3580 has a slot for M.2 SSD "One M.2 2280 solid-state drive, Class 35 and Class 40"
I can't find any reference about the type of keying (B/M/B+M) that it should be.. Am I missing something? 

For example this Intenso SSD (M.2 2280, SATA III) is it compatible? Should I look only for NVMe SSD and which key type?

Thank you for your time!