Why might screen cell #2 be reacting stronger than screen cell #1?

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Please select the single best answer

	The patient has more than one antibody and all corresponding antigens are on screen cell #2 but not on screen cell #1
	There are more D antigen sites on cell #2
	The patient has an antibody other than anti-D and screen cell #2 has a double dose of the antigen, whereas cell #1 has only a single dose
	Operator variability - When dislodging the cell buttons during reading, the technologist shook screen cell #1's test more vigorously than cell #2's test.
	All of the above are possible