Given the following sentences (1) Our production staff at Sweet Creations will begin using new candy manufacturing equipment on October 28. (2) We made the decision to install the CandyMaker 650 during the week of October 14. (3) This new candy production machine uses robotic features and will save much time for our company. (4) The CandyMaker also provides several safety features. (5) Employee safety receives much importance at our company. (6) Therefore, we are sure that you will appreciate this upgrade. (7) Please attend a staff orientation with the new machine on Friday, October 25 from 12 to 1 pm. (8) We will meet in Production Room B, the location of the CandyMaker 650. (9) Hector Galvez, a representative for Candy Solutions, will apprise you of how this new machine works. (10) If you have any questions, please contact me at your earliest convenience. (11) After the meeting, we will serve pizza to each and every person. Mandy Summers. Determine which of the following sentences uses a concrete noun as a simple subject from the following options? a. Sentence 1 b. Sentence 2 c. Sentence 6 d. All the above