Which of the following statements are TRUE?

$${\rm I}.\,\,\,\,\,\,$$ The content diagram should depict the system as a single bubble.
$${\rm II}.\,\,\,\,$$ External entities should be identified clearly at all levels of $$DFDs$$
$${\rm III}.\,\,$$ Control information should not be represented in $$DFD$$
$${\rm IV}.\,\,$$ A data store can be connected either to another data store or to an external
$$\,\,\,\,\,\,\,\,\,\,\,\,$$entity.

Consider the following statements about the cyclomatic complexity of the control flow graph of a program module. Which of these are TRUE?

$${\rm I}.\,\,\,\,\,\,$$ The cyclomatic complexity of a module is equal to the maximum number of
$$\,\,\,\,\,\,\,\,\,\,\,$$linearly independent circuits in the graph.
$${\rm II}.\,\,\,$$ The cyclomatic complexity of a module is the number of decisions in the
$$\,\,\,\,\,\,\,\,\,\,$$module plus one, where a decision is effectively any conditional statement in
$$\,\,\,\,\,\,\,\,\,\,$$the module.
$${\rm III}\,$$ The cyclomatic complexity can also be used as a number of linearly
$$\,\,\,\,\,\,\,\,\,\,$$independent paths that should be tested during path coverage testing.