A process produces a widget with a critical height dimension. You decide to monitor the process output of the height using both a caliper, calibrated to 0.001", and a go/no-go gage. What type of monitoring tools are the caliper and go/no-go gage?
a. Both the caliper and go/no-gage are attribute tools
b. Both the caliper and go/no-gage are variable tools
c. The caliper is an attribute tool while the go/no-gage is a variable tool
d. The caliper is a variable tool while the go/no-gage is an attribute tool