Final answer:
Grid cut-off results in quantum noise and low contrast (options 1 and 2), but not necessarily a low exposure indicator number. Thus, the correct answer to the question regarding what is present with grid cut-off is A: 1 & 2 only.
Step-by-step explanation:
When dealing with grid cut-off, one typically encounters issues like quantum noise and low contrast but not necessarily a low exposure indicator number. Grid cut-off can cause areas within the radiographic image that are underexposed due to improper alignment of the grid or issues with grid ratio, leading to increased quantum noise and reduced contrast. However, the exposure indicator number is a reflection of the overall exposure received by the image receptor and may not directly indicate the presence of grid cut-off, as it can be affected by various factors such as mAs and kVp settings. The correct answer to the question, "Which of the following is present with grid cut-off? (1) quantum noise, (2) low contrast, (3) low exposure indicator number" is option A, which is "1 & 2 only".