Sentence examples similar to response is optional from inspiring English sources

The fact that a creative response was optional rather than mandatory sets our programme apart from many reported in the literature [ 1, 3, 8, 9].

Open-ended responses were optional, and allowed participants to report any other CAM practices used that were not listed in the response choices.

Qualitative short response questions were optional and placed near the end of the survey.

Their use is optional.

Sensitivity is optional.

Digitization is optional.

Sugar is optional.

Cutlery is optional.

(Power operation is optional).

Sex is optional".

"All else is optional").