Working memory deficits are found ______.
a. in cases of acute schizophrenia, but not in chronic schizophrenia or in the healthy first-degree relatives of people with schizophrenia
b. in chronic schizophrenia, but not in acute schizophrenia or in the healthy first-degree relatives of people with schizophrenia
c. in both acute and chronic schizophrenia, but not in the healthy first-degree relatives of people with schizophrenia
d. not only in both acute and chronic schizophrenia but also in the healthy first-degree relatives of people with schizophrenia