Question: In the script below, for a student's exam marks, what can be used to remove all - 9 9 from exam _ marks and extract

In the script below, for a student's exam marks, what can be used to remove all -99 from exam_marks and extract the correct marks?
import numpy as np
exam_marks = np.array([[89,78,92,90],
[-99,-99,-99,-99],
[80,90,78,92],
[-99,-99,-99,-99]])

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