Question $22$ pointsOn April $2,2023,$ Lael offers to paint Winston's house for $$5,000.$ Lael promises Winston to keep the offer open for $10$ days. On April $3,2023,$ Lael calls Winston and revokes the offer. Which of the following is true?O a$.$ Lael was required to keep the offer open for $10$ days. O b$.$ Lael was not required to keep the offer open for $10$ days. O c$.$ This is an example of an option contract. d$.$ Both a$.$ and c$.$ are correct.