What is the difference between ARM and Thumb instructions?

$5$ points

ARM and Thumb are similar sets supported by ARM cores.

ARM and Thumb is the same sets supported by ARM cores. For instance, ARM instructions are $64$ bits wide, and Thumb instructions is $32.$

ARM and Thumb are two different instruction sets supported by ARM cores. For instance, ARM instructions are $32$ bits wide, and Thumb instructions is $16.$

ARM and Thumb is a set of instruction supported by ARM cores. For instance, ARM instructions are $16$ bits wide, and Thumb instructions is $32.$