Question: Let p be the statement "DATAENDFLAG is off," q the statement "ERROR equals 0," and r the statement "SUM is less than 1,000." Express the following sentences in symbolic notation.
a. DATAENDFLAG is off, ERROR equals 0, and SUM is less than 1,000.
b. DATAENDFLAG is off but ERROR is not equal to 0.
c. DATAENDFLAG is off; however, ERROR is not 0 or SUM is greater than or equal to 1,000.
d. DATAENDFLAG is on and ERROR equals 0 but SUM is greater than or equal to 1,000.
e. Either DATAENDFLAG is on or it is the case that both ERROR equals 0 and SUM is less than 1,000.