The ____ function returns a nonzero number if the character is a letter; otherwise returns a zero.

An Activity is launched by using a(n) ________ that indicates an action to be performed and the data on which to perform that action.

a. Action b. IntendedAction c. Launcher d. Intent

Which of the following methods uses familial reference to loop through a collection of child nodes?

A. for (var n = node.firstChild; n !== null; n = n.nextSibling) {commands} B. for (var n = node.firstChild; n !== null; n = n.previousSibling) {commands} C. for (var n = node.firstChild; n !== null; n = n.firstChild) {commands} D. for (var n = node.firstChild; n !== null; n = n.lastChild) {commands}